Here Is A list of All The Pokémon Viewable from Pokéballs in Super Smash Bros Melee
Pokémon Picture Pokémon Feature
Articuno:
Blizzard: Freezes Any Enemy nearby
Bellossom:
Sleep Powder: Will Make any person that touches it fall asleep
Blastoise
Hydro Pump: Fires huge bursts of water across the stage
Celebi:
--: Just flies away but gives you 10,000 points and a Celebi Trophy
Chansey:
Softboiled: Releases 6 eggs that can be eaten or thrown to reveal a new item
Charizard:
Flamethrower: Will shoot out flames at both sides, one side at a time.
Chikorita:
Razor Leaf: Will shoot out leaves that travel across the screen slightly damaging whoever gets hit.
Clefairy:
Metronome: Will execute a random move from a handpicked selection
Cyndquil:
Flamethrower: Will pause for a second before hovering above the ground and continuously shoot out flames in one direction
Electrode:
Explosion: Will blow itself up, damaging anyone nearby including who released it. You can pick it up at various times to throw it.
Entei:
Fire Spin: Will shoot out a blast of fire upwards, damaging anyone up there and near it.
Goldeen
Splash: Just Splashes Around Doing Nothing
Ho-oh:
Sacred Fire: Will fly up into the background then wreck havoc on whoever is unlucky enough to be where it's Sacred Fire lands
Lugia:
Aeroblast: Will fly up into the background then wreck havoc on whoever is unlucky enough to be where it's Aeroblast lands
Marill:
Rollout: Will dash across the screen on the ground damaging whomever it touches
Mew:
--: Just flies away but gives you 10,000 points
Moltres
Sky Attack: Will burn whomever it touches then it will just fly off upwards after a few seconds
Porygon2: Tackle: Will immediately jump forward on the enemy once it's released
Raikou:
Spark: Will fire off a shock wave around itself and it will shock any opponents that touch it
Scizor:
Fury Cutter: Will run forward then jump up in the direction of an opponent
Snorlax:
Body Slam: Will pause for a second then jump up off the screen and come back down at a much larger size damaging anyone on the way up or down
Staryu:
Swift: Will float around at starts firing Stars at your enemies
Suicune:
Icy Wind: A fairly large range of icy wind swirls around Suicune catching anyone in its range
Togepi:
Metronome: Will executes a random move that can cause various effects.
Unown: Hidden Power: Will fly off the screen then come back with many other Unown and they travel across the screen in a random direction for a short while
Venusaur:
Earthquake: Will stomp on the ground damaging nearby opponents in a fair area around him
Weezing:
Poison Gas: Releases a poisonous gas damaging whoever touches it
Wobbuffet:
Counter: If you touch it it hurts you
Zapdos:
Thundershock: Shocks anyone nearby for a couple of seconds
 
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