The movie begins in a forest (I cannot identify which one, probably Illex) with Celebi flying away from something, it appears to be a Houndoom running after it. After a few attacks from the Houndoom, a Scyther joins in the game. This time a succesfull attack but Celebi easily blocks the blow with its barrier. Houndoom uses it's Flame Thrower and Celebi instinctively uses its barrier again. But the force is too strong for Celebi to hold back and falls to a field of grass. A man comes up to it, saying to Celebi he's a hunter and picks out a device, which he throws at Celebi. Celebi dodges and flies away, Scyther and Houndoom after it.

Sammy walks Makirds a huge fallen log with a tunnel through it. A woman is calling to him. It seems to be Sammy's mom or sister (I'm not sure WHICH) and gives him a bread wrapped in a leaf. Sammy gives his regards and goes in the tunnel.

Later, Sammy is drawing a picture of three Bellossoms but something scares them off, along with some other Pokemon. Sammy sees Celebi, then Houndoom and Scyther, and then the hunter. Sammy runs after them and finds Houndoom and Scyther, Scyther pinning Celebi down with it's arms. Sammy yells and tries to get to Celebi, but the Houndoom shoots a flame at him, in which Sammy dodges. Celebi cries out and vines tangle up the two other Pokémon and Sammy goes over to help Celebi. The hunter catches up and tells Sammy to hand over the Celebi. Sammy however just runs for it and stops at a shine-looking podium. Celebi cries out again and the whole forest starts to wave about, glowing blue. Sammy wonders what's going on and a bright light engulfs them, when the light goes away, all that's left is Sammy's sketch book.

(Into... says it's a Pocket Monster Movie and then leaves fly by ending with a single water drop going off a leaf splashing in some water, the wave effect is used as the letter background for the word Serebii)

40 Years later...

Brock and Misty are in a port town, waiting for Ash, who is late for a boat ride. Brock sends Crobat to find Ash. Ash is, however, in a square area of the town about to fight another trainer. The trainer shows off his Croconaw and Ash uses Pikachu. The battle goes on for a while Pikachu ending shocking both the Croconaw and its trainer. Ash goes over to the trainer but Crobat comes and tells Ash to go to the boat. Ash goes over to the pier as fast as he can. Brock sees his Crobat and then Ash and him and Misty get on the boat. Ash is gets there, but is blocked by a cargo car. (the ones you see in the airport) When the car goes by, Ash notices the boat has started to go. He runs to a pier and attempts to jump to the boat. Brock tries to catch him, but misses, however another person catches Ash. They do the introductions, the person being Maki, a somewhat built tourist guide of the forest that's nearby.

Meanwhile, 'The Iron-Masked Marauder' pushes around the hunter from 40 years ago, asking about Celebi. Fed up with the answer, 'The Iron-Masked Marauder' goes outside to the hunter's collection of Pokemon. Noticing a Tyranitar, 'The Iron-Masked Marauder' tells his Sneasel to open the cage. 'The Iron-Masked Marauder' gets out a Pokeball, but it's no ordinary Pokeball, it's a Dark Ball. He tosses it at the Tyranitar, causing it to become black energy instead of red. The ball emits small purplish lightning and 'The Iron-Masked Marauder' throws it. The Bagirasu is somewhat different now, more evil... 'The Iron-Masked Marauder' orders it to destroy the hunter's home and it does without questions.

During the boat ride Ash notices Suicune, so does Pikachu and he says that he saw it, but the Suicune runs away as soon as everyone sees it. When they get to the destination, Ash calls Oak to tell him about Suicune, obviously, Oak doesn't believe it. (Tracey is in the background) Afterwards, Ash's Muk stirs up some trouble and then hangs up. Maki gives them offers them a tour and Ash aggrees. Jesse, James, and Meowth are observing them in a hang-glider pedaled-propellored thing, but Jesse stops pedaling and sends them off to the ground. They come by a waterfall, he simply sets up a two balloons that's by the sides of boat. The boat/balloon makes it's way to a treetop village and lands there. Ash and co. finds the same huge fallen log with the tunnel and tries to go in, when an old woman warns him of something. A young woman goes up to them, Brock immidiately trying to flirt with her. Her name is Diana and she is the daughter of Towa, the old woman. Diana has a striking resemblance to Towa. Diana just says about what happened a long time ago.

The forest waves around and glows blue, Pikachu knowing what it is and starts running, Ash and co. running after him. They get to the shrine and see the light, Sammy and Celebi appearing there. Celebi flees off behind the shirne before Ash and co. figures out it was there in the first place. Ash tries to get Sammy up but he won't. Ash decides to carry him back to the village.

When they get back, Sammy wakes up, however his first impulse is Celebi. He intentionally pushes Ash around but Sammy comes to his senses and asks what happened. Diana comes out and her mom. Towa immidiately knows it's Sammy but Sammy doesn't know it's Towa. They go to Maki's house and Towa presents Sammy's sketchbook. Sammy is amazed and flips through it. Although he wonders about Celebi.

Pikachu again sensing something, goes out and back behind the tunnel, Ash and Sammy following. They come up to several fallen logs with a vine coming down. Ash and Sammy climb it and find out a lot of Pokemon has gathered up near a hole. Ash goes up to it and finds Celebi, although he's not as stunned as he saw the other legendaries. He tries to pet Celebi but Celebi on impulse uses a pyschic attack on Ash, blowing him, Sammy, and the Pokemon nearly off the log. Ash, angry, quickly scampers up the log to Celebi and scolds at it, Celebi uses it's "Vine whip" on Ash and Sammy. Sammy is telling Ash not to be so harsh to it. Ash tries to talk to it again, both fending themselves from the vines. After a few nice comments, Ash again tries to pet the Celebi, this time Celebi trusting Ash. Ash and Sammy return to Maki's treehome and Mika tells them there's a lake that can help the Celebi since the water is pure. Ash and co. and Sammy go on to find this lake. they encounter the three from Team Rocket, in turn they say their motto. Sonansu happens to pop out in the end and breaks the branch they were on. Ash and co. uses this to escape.

'The Iron-Masked Marauder' isn't gonna give up on Celebi, he goes through the forest in a four spider-legged mech (as you will) to hunt it down. While searching for the lake, Ash just happens to run into 'The Iron-Masked Marauder'. 'The Iron-Masked Marauder' demands Celebi or... face utter destruction. Of course, everyone says no and Bisahsu releases his newly stolen Tyranitar. 'The Iron-Masked Marauder' orders it to attack and the Tyranitar starts using it's Hyperbeam to go on a rampage against Ash and them. Jesse and James see 'The Iron-Masked Marauder''s mech and decides to attack it themselves. James releases his Weezing to use Smoke Screen. However they relize it's really 'The Iron-Masked Marauder' and they start doing the "I'm not worthy" bow.

Along the way, Misty's knee is hurt and collapses on her knees. However this delay allows 'The Iron-Masked Marauder''s Sneasel and Scizor to catch up. Ash and Sammy prepare for the battle. Sammy gets out a old technological Pokeball. He turns a valve on it and opens it up, a Charmeleon comes out. Ash just simply throws his Pokeball containing Bayleef, leaving Sammy somewhat surprised. Bayleef goes after the Scizor. Bayleef uses Razor Leaf but the Scizor counters with Double Team and a slam to Bayleef. Bayleef tries again but again, Bayleef gets countered. Sammy tells Ash his Bayleef should focus on where it is. Ash tells Bayleef that and the Bayleaf settles to figure it out. Figuring the location, Bayleaf gives it Razor Leaf and the Scizor and it goes down in one blow. The Charmeleon however is having no problem with the Sneasel. It finishes it off with a quick slam to a rock.

'The Iron-Masked Marauder' walks by the path Ash and co. ran by, noticing his two Pokemon tied up to a rock. He just laughs a bit and walks on. (how stupid... and the next part reminds me of Princess Monoke by scenery)

Ash and them find their way to a foggy part of the forest, where they encounter a Ursaring and a Teddiursa. Sammy tells the crew to follow it. The Ursaring stops and a Stantler comes by. They follow the Stantler until they come to a Furret, which they follow to the lake. Sammy takes over and walks in the water until it's waste deep and let's Celebi touch the water. Ash notices that a lot of Pokemon has gathered up. Celebi then goes in the water to where the sunlight is good. Celebi is then revitalized and flies to them, happily. Ash and Sammy decide to follow Celebi as it goes underwater. Being human and all, Ash and Sammy run out of air and surface, Celebi following them using its psychic powers to allow them to float. Celebi goes over to Misty and touches her knee, which heals it and she is thankful. Then the two fly around with Celebi for a while. When Ash and Sammy went back to Brock and Misty, they decide to follow Celebi.

Celebi comes to a berry tree and picks a berry and eats it. Celebi enjoys it, so much that it dances around and the others pick a berry to eat, they too enjoy it. Ash gathers some for a later snack. After a day's work and play, the crew sets up camp in the forest. Ash wakes up in the middle of the night and spots Sammy sketching. Ash goes over to him to see what he's drawing. It's Celebi and Pikachu sleeping, Celebi sleeping on Pikachu's shoulder. Ash talks for a while but Sammy is somewhat disturbed and goes off somewhere, Ash following. Ash's stomach growls and he gets a little embarressed. Sammy shares the bread he was given to Ash. (and they said it was good...) Pikachu wakes up from the voices of Ash and Sammy talking. Pikachu goes after them and Celebi slumps down to the ground, waking it up. Celebi goes to Ash and Sammy along with Pikachu and they find a cluster of Metapods, evolving. They gaze upon the new Butterfree and decide to climb up a tree for a better view. When they get there, the Butterfree are flying along the sunrise, releasing the sparkly powder. All of them enjoy the sight.

The next day, they go back to Mika's house. It just so happens that 'The Iron-Masked Marauder' runs into them and attempts to get Celebi again. However Jesse and James are there behind them with nets. Escaping is useless so they try to fight. Pikachu runs in for a Thunderbolt but a barrier deflects the bolt. 'The Iron-Masked Marauder''s mech uses it's trapping device and grabs Celebi within two tries! (ouch...) The claw like trap shocks Celebi into a good low stamina and 'The Iron-Masked Marauder' gets out his Dark Ball and... captures Celebi!

Pokémon gather around and Ash is now totally mad at 'The Iron-Masked Marauder' and decides to climb up one of the mech's legs and fight 'The Iron-Masked Marauder' for it. Ash succeeds in only getting the Dark Ball but he falls to the ground and 'The Iron-Masked Marauder' comes. He steps on Ash's hand while he's still down but Ash gives up on it and faints. 'The Iron-Masked Marauder' laughs and releases the brainwashed Celebi, which he orders it to take care of everyone. Celebi uses it's Psychic to blow Ash and co. away, then rams the gathered Pokemon with its barrier. 'The Iron-Masked Marauder' orders something else afterwards and Celebi starts up a huge whirlwind that gathers up leaves and branches, and even sucks up Jesse. Back at Mika's home, Mika, Diana, and Maki notice the whirlwind, they all huddle up in Maki1's boat/balloon.

Up upon the mountains, Suicune senses the danger and goes to the forest at top speed. This is the last resort...

Ash wakes up, acting like Sammy when he woke up. The other tell him that Celebi was caught and started making a the thing 'The Iron-Masked Marauder' wanted.

Later, a huge floating spiked sphere of branches and leaves hovers Maki1rds the lake. The one who stands alone at the edge, 'The Iron-Masked Marauder'. Jesse is held captive a opening, hanging from vines. Jesse obvoiously tries a negotiation but it ends in awe. Coming up to the target point, 'The Iron-Masked Marauder' has the core, Celebi, change the sphere's form into a Scyther looking thing. Celebi is tided down at the center of the "head" surrounded by vines and a barrier, it seemed to have no expression on its face. (trust me, you'd probably cry at what happened to it) Maki picked up Ash and co and they head for the...monster thing. As a test fire, 'The Iron-Masked Marauder' orders Celebi to fire at the balloon. However everyone notices that Celebi is in there, doing whatever 'The Iron-Masked Marauder' says. A orb or purple energy forms up at the mouth of the monster and then fires, blowing off only one of the two balloons on Maki1's boat, sending it to the lake. Celebi fires another beam, but misses and hits the lake, causing the water to go impure. Celebi then controls the monster to go to the lake. Ash and Sammy stay behind while the rest try to get cover. However, what can they do? Ash tells Pikachu to use Thunderbolt but 'The Iron-Masked Marauder' jumps to a branch nearby. 'The Iron-Masked Marauder' seeing them, has Celebi fire another beam. Celebi starts charging and fires but, Suicune rushes in to save the day, it picks up Ash and Sammy and rusn off to safety. 'The Iron-Masked Marauder' seeing it .also wants Suicune, he releases his Tyranitar and it starts it's rampage. Brock, seeing this, he releases his Onix to help. Onix distracts the Tyranitar while Suicune escapes. Onix gets pummeled however, so Suicune uses its Ice beam and the Tyranitar goes down in one hit. Onix, still having some strength, sends Tyranitar flying to the lake. Brock returns it and the Suicune goes after the branch monster. However, vines grapple onto Suicune, shocking it with dark energy.

Ash and Sammy jump off Suicune in attempt to find and rescue Celebi. They miss however but Jesse catches them. They find a opening they could use and they start to climb the vines. They shout to Celebi telling it to stop. Celebi gets a flashback of when Ash and co. are flying with it and stops momentarily. 'The Iron-Masked Marauder' wonders what's going on, because Suicune isn't getting shocked anymore. Celebi starts up again, both yelling another "stop it" and Celebi remebers when Ash and co. are at the berry tree. 'The Iron-Masked Marauder' orders it to shock Suicune and again Celebi starts. They get to the top and try to get Celebi to stop again, Celebi remembering when they were watching the Butterfree. Finally coming to its senses, Celebi stops and the monster starts to crumble into the lake. When the whole monster is destroyed, Celebi, Ash and Sammy are floating. They float down to the lake's edge.

However, something isn't right about Celebi, it seems wilted. (picture Celebi with wrinkles, not a pretty sight) Sammy tells Ash to try the method they did before. But the water is too impure. Sammy tells Ash that Suicune can purify water, so Ash tells Suicune to purify the water. Suicune hops along the water, purifying it with every step. Ash tries again, but it won't work. Ash then tries to give Celebi one of the berries he picked, but it just drops into the water. He tries again, and again, and again, finally he gives up. Celebi isn't responding, isn't moving, could it be... dead? Everyone lost all hope...

The forest starts to wave and glow blue and a bright light shines above the lake. A multitude of Celebi comes out of the light, using their powers to help the "dead" Celebi. The original Celebi is revived, happy to see its friends and then the others go back to where-ever they came from. Celebi goes back to the group but... 'The Iron-Masked Marauder' appears from the water and catches Celebi! 'The Iron-Masked Marauder' activates a jet pack and flies off, giving that evil laugh of victory. Ash jumps onto his leg with Pikachu, agian trying to save Celebi. 'The Iron-Masked Marauder' tries to kick Ash off, but Ash dodges and he tells Pikachu to use Thunderbolt. Pikachu does and blows up the jet pack, sending everyone falling. Ash tries to catch Pikachu... but he knows he'll fall to his death. However Celebi stops him with its psychic power and saves Ash. 'The Iron-Masked Marauder' falls into the forest, trees breaking his fall. Coming upon Maki, Mika, and Diana, all three having angry faces and Maki cracking his knuckles like he wants to fight. Mika scolds at 'The Iron-Masked Marauder' for his stupidity. However, the three aren't alone, dozens of angry Pokemon gather around him. 'The Iron-Masked Marauder' tries to use Scizor and Sneasel, but he left them where they were! Caterpies, Weedles, and Spinaraks uses their String Shot to trap 'The Iron-Masked Marauder'. When Celebi came back, it opened up the time portal, so Sammy could go back. Everyone says their goodbyes, Ash not willing to part with a good friend yet.

Later Jesse is floating in the lake, James and Meowth coming to her in a small raft. While they argue, the Bangiarasu jumps out of the water and breaks the raft. The three just decide to float there.

Sammy wakes up in front of the shrine, Celebi no where to be seen. Mika runs up to him and asks if he was okay and so forth.

(Credits)

Maki goes back to the town.

Tracey finds Sammy's sketchbook while cleaning up Oak's home. He flips through it and finds the picture Sammy drew, but Celebi seems to be faded out a bit. Celebi spies on Ash and co. when they came back to the berry tree

Great Thanks to Xeno Lugia for making this brilliant Synopsis so quickly and allowing us to use it