Everything you need to know about the game, is here.
Expected Starting Roster:
Mario
Yoshi
Peach
Bowser
Wario
Donkey Kong
Diddy Kong
Link
Zelda/Shiek
Kirby
Samus/Zero Suit Samus
Fox McCloud
Pikachu
Pokemon Trainer
Lucas
Ice Climbers
Ike
Pit
Captain Olimar
Isaac
Lip
Boss Characters:
Dino Piranha
Evil Black Jewel
Sumo Kong
Usurper King Zant
Dyna Blade
Kraid
Giratina
General Scales & RedEye King
Giygas
Deathborn (Main Antagonist)
Primoid (Made him up)
Laz-Or Cruncher (Made him up)
Master Hand (Only Classic Mode and Boss Battle Mode)
Crazy Hand (Only Classic Mode and Boss Battle Mode)
Starting Assist Trophies:
Hammer Brother
Lakitu
Kat & Ana
Tingle
Knuckle Joe
Metroid
Andross
Jeff
Samurai Goroh
Nintendog
Dr. Wright
Little Mac
Excitebike
Stafy
Jill
Devil
Saki Amamiya
Helirin
Mr. Resetti
Pokemon: (In order of Rarity)
Rare Pokemon:
Mew
Celebi
Jirachi
Manaphy
Moltres
Entei
Suicune
Ho-oh
Lugia
Groudon
Kyogre
Rayquaza
Deoxys
Regice
Regirock
Registeel
Latias
Latios
Dialga
Palkia
Uncommon Pokemon:Aggron
Bellossom
Electrode
Exploud
Salamence
Staryu
Tropius
Wobbufet
Metagross
Seviper
Torkoal
Snorlax
Togepi
Weavile
Infernape
Common Pokemon:
Chickorita
Torchic
Turtwig
Munchlax
Piplup
Gulpin
Goldeen
Confirmed Stages:
Items:
Beam Sword
Ray Gun
Bob-omb
Bunny Hood
Cloaking Device
Fire Flower
Hammer
Flipper
Green Shell
Home Run Bat
Lip's Stick
Metal Box
Mr. Saturn
Motion Sensor Bomb
Super Mushroom
Fan
Parasol
Party Ball
Rune Sword
Poison Mushroom
Pokeball
Red Shell
Screw Attack
Starman
Star Rod
Deku Nut
Dragoon
Emblem Sword
Super Scope
Warp Star
Freezie
Barrel Cannon
Soccer Ball
Maxim Tomato
Food
Heart Container
Crate
Barrel
Capsule
Egg
Smash Ball
Assist Trophy
Spring
Timer
Sandbag
Lucky Sandwich
Moo Moo Milk
Cracker Launcher
Gooey Bomb
Hothead
Pitfall
Smart Bomb
Smoke Ball
Franklin Badge
Superspicy Curry
Golden Hammer
Lightning
Banana Peel
Team Healer
Bumper
Unira