Legendary Pokémon

You will encounter Dialga or Palkia, depending on your version, as you progress through the story. As Team Galactic's plan unfolds through the Sinnoh region, you will make chase to Spear Pillar where Cyrus will unleash his plans to create a new world. However, when you defeat him, Uxie, Mesprit and Azelf will appear and free Dialga/Palkia, and it will then want to battle you.

Dialga Level 47

OT: Yours ID: Yours Ability: Pressure

??? Nature. Date of Receiving Spear Pillar. Level Met: 47

Ancient Power Slash Flash Cannon Roar of Time

Palkia Level 47

OT: Yours ID: Yours Ability: Pressure

??? Nature. Date of Receiving Spear Pillar. Level Met: 47

Ancient Power Slash Aqua Ring Spacial Rend

After preventing the cataclysm at the Spear Pillar, you'll now be able to visit the lakes and encounter the Pokémon. In the cave at Lake Acuity, you will find the Pokémon Uxie.

Uxie Level 50

OT: Yours ID: Yours Ability: Levitate

??? Nature. Date of Receiving Lake Acuity. Level Met: 50

Imprison Extrasensory Amnesia Psychic

After preventing the cataclysm at the Spear Pillar, you'll now be able to visit the lakes and encounter the Pokémon. In the cave at Lake Verity, you will find the Pokémon Mesprit but it won't battle you but rather will roam through Sinnoh to be found, being tracked by the Marking Map app on the Pokétch. Its IVs, Shiny status and Nature are determined when it leaves Lake Verity.

Mesprit Level 50

OT: Yours ID: Yours Ability: Levitate

??? Nature. Date of Receiving ??. Level Met: 50

Imprison Extrasensory Charm Psychic

After preventing the cataclysm at the Spear Pillar, you'll now be able to visit the lakes and encounter the Pokémon. In the cave at Lake Valor, you will find the Pokémon Azelf.

Azelf Level 50

OT: Yours ID: Yours Ability: Levitate

??? Nature. Date of Receiving Lake Valor. Level Met: 50

Imprison Extrasensory Nasty Plot Psychic

After you get the National Dex and go to the Fight Area, you will meet Buck who says about a treasure that is to be found in Stark Mountain. When you go to Stark Mountain, you will help Buck get to the final room where he will take the Magma Stone. Return to the Survival Area and his grandfather will tell him that the Magma Stone needs to be there else the volcano will erupt so Buck goes and puts it back. If you go back to the deepest room in Stark Mountain, you will find the Legendary Pokémon Heatran.

Heatran Level 70

OT: Yours ID: Yours Ability: Flash Fire

??? Nature. Date of Receiving Stark Mountain. Level Met: 70

Metal Sound Earth Power Heat Wave Stone Edge

After you get the National Dex, you'll be given access to Snowpoint Temple in the north of Snowpoint City. At the bottom floor in the middle of the ice puzzle is Regigigas, but it is sound asleep. If you bring Regirock, Regice and Registeel caught from Ramanas Park to it, it will awaken offering you the chance to catch it..

Regigigas Level 70

OT: Yours ID: Yours Ability: Slow Start

??? Nature. Date of Receiving Snowpoint Temple. Level Met: 70

Wide Guard Zen Headbutt Heavy Slam Hammer Arm

After you get the National Dex, you'll be given access to the Sendoff Spring, a mysterious fourth lake to the east of Route 214. In this lake you will fin Turnback Cave. This cave is a winding maze that gives you instructions on the pillar. Your task is to get to the end in 30 rooms or less. The pillar gives you a specific number and that number equates to the clockwise exit you need to take on entering each room. If you follow the instructions, you will be find Giratina in its Altered Forme.

Giratina Level 70

OT: Yours ID: Yours Ability: Pressure

??? Nature. Date of Receiving Turnback Cave. Level Met: 70

Shadow Force Pain Split Aura Sphere Dragon Claw

After you get the National Dex, you'll be told by the Sailor in Canalave that he has lost the feel for sailing since his child got sick. If you speak to the child, you will learn that he is stuck in a nightmare. You will learn that the Lunar Feather will cause him to wake up so you go with the Sailor to Fullmoon Island. There you will find Cresselia. It won't battle you but will run away and roam Sinnoh, being tracked by the Pokétch Marking Map app. The Lunar Feather will remain. Its IVs, Shiny status and Nature are determined when it leaves Fullmoon Island.

Cresselia Level 50

OT: Yours ID: Yours Ability: Levitate

??? Nature. Date of Receiving ???. Level Met: 50

Slash Psycho Cut Moonlight Safeguard

After you get the Oak's Letter item in an event, you can take the item to the special white stone at the end of Route 224. Professor Oak will come and say you need to write down who you're thankful for. When you do, a path will emerge and you can encounter the Pokémon, Shaymin

Shaymin Level 30

OT: Yours ID: Yours Ability: Natural Cure

??? Nature. Date of Receiving Flower Paradise. Level Met: 30

Growth Magical Leaf Leech Seed Synthesis

After you get the Member Card item in an event, once you have beaten the Elite Four and obtained the National Pokédex, you can use the Member Card to enter the locked inn in Canalave City. Sleep in the bed and you'll be taken to Newmoon Island to encounter Darkrai

Darkrai Level 50

OT: Yours ID: Yours Ability: Bad Dreams

??? Nature. Date of Receiving Newmoon Island. Level Met: 50

Hypnosis Sucker Punch Foul Play Double Team

Location: Hall of Origin

When you have save data from Pokémon Legends: Arceus and have completed all the main missions in that game, then you will be able to get the Azure Flute from your bedroom in Twinleaf Town. Take this to Spear Pillar after you have caught both Dialga / Palkia, have the National Pokédex & completed the Elite Four and and use it to access the Hall of Origin to battle the Mythical Pokémon Arceus

Arceus Level 80

OT: Yours ID: Yours Ability: Multitype

??? Nature. Date of Receiving Hall of Origin. Level Met: 80

Healing Wish Future Sight Recover Hyper Beam