Welcome to Gaia! ::

Here's the full list of Pokéball Pokémon in Brawl:
Dialga or Palkia appears in Mt. Coronet, but it remains in the background rumbling the stage.

Torchic uses ability Blaze - Critically hurts those surrounding its flaming body
Celebi performs Teleport - Does nothing
Chikorita performs Razor Leaf - Launches leaves repeatedly at foes; may trap foes
Deoxys performs Hyper Beam - Fires a charged beam down onto the stage
Entei performs Fire Spin - Traps foes in a vortex of fire
Gulpin performs Stockpile and Spit Up - Inhales foe and if foe doesn't escape in time, spits him out
Munchlax performs Stockpile and Swallow - Eats items laying about the stage
Groudon uses ability Drought - Doesn't move upon summoned, but anyone touching it gets hit; high knock-back damage
Staryu performs Swift - Chases foe, and then attacks foe with a horizontal barrage of stars
Ho-Oh performs Sacred Fire - Traps foes in a pounding vortex of fire that causes critical damage more so than Entei's
Jirachi
Snorlax performs Body Slam - Leaps up, then descends down through the stage hitting those in its way
Bellossom performs Sleep Powder - Stands by and puts anyone near it to sleep
Kyogre performs Spout - Moves to the side of the stage and pushes foes back with water, similar to Mario's FLUD
Latias performs Aerial Ace with Latios - Quickly flies around the stage, knocking foes back
Latios performs Aerial Ace with Latias - Quickly flies around the stage, knocking foes back
Lugia performs Aeroblast - Retreats to the back of the stage and unleashes a critical beam that sends foes flying
Manaphy performs Heart Swap - Swaps the hearts of characters, causing user to control someone else for a while
Weavile performs Quick Attack - Runs from one side of the stage to the other, pushing foes back and forth
Electrode performs Explosion - Charges up, then explodes giving off high knock back damage and percent
Metagross performs Earthquake - Stomps the ground and makes foes get stuck in the floor; stomps again and sends them up
Mew performs Teleport - Does nothing
Meowth performs Payday - Chases after foe with a barrage of coins, similar to Piplup's Surf
Piplup performs Surf - Follows foe and shoves them back with water
Gardevoir performs Barrier - Moves around creating a circular barrier where players can stand to be protected from projectiles
Wobbuffet performs Counter - If hit, continuously wobbles back and forth causing damage
Suicune performs Blizzard - Bounces foes around a flurry of wind that may freeze
Togepi performs Metronome - Randomly does a Pokemon's attack
Goldeen performs Splash - Does nothing
Bonsly eventually performs Self-Destruct - Walks around the stage; can be picked up and thrown; eventually blows up

Well the other ones like Darkrai have never been seen in the retail copy of brawl.

Between Weavile, Metagross, and Gardevoir, I think they read my mind while choosing pokeballs.

That list up there is definitely incomplete. Check this out...

http://www.youtube.com/watch?v=gHACxqy9clE

In that video, around 1:04, Moltres comes out of the Pokeball. And becasue Luigi is in the fight, this IS the retail copy of Brawl.

EDIT: I think Suicune's attack is wrong, too. I've seen it firing off a beam. I've also seen no evidence of Bonsly exploding...

This list cannot be called complete unless someone has hacked the game to see what all of the possible Pokeball Pokemon are. For one, Moltres is absent in your list.

I've found a few things to be incorrect. First, like Nekkyo stated, Suicune's attack has changed. Instead of a whirlwind, it fires a beam. Secondly, You say that Mew and Celebi do nothing. In fact, they can leave rare "presents," such as CDs. http://www.smashbros.com/en_us/items/mball/mball07.html

I hope the list on smash wiki is the real one.

dude, that is SO awesome