Some suggestions-
Squirtle
B+Up: Skull Bash (sorta like Teleport)
B: Bubblebeam
B+Forward: Tackle
B+Down: Surf (a tidal wave rushes onto the screen, and hits downwards, takes a while to use)
Charmander
B+Up: dunno
B: Flamethrower
B+Forward: Fire Spin (charges forward, covered in flame)
B+Down: Slash (a downwards swipe)
Bulbasaur
B+Up: Vine Whip
B: Stun Spore (immbolises the opponent)
B+Forward: Razor Leaf
B+Down: Solar Energy (Pressing B launches Solar Beam)
Meowth
B+Up: Pay Day (jumps, and coins strike everyone around)
B: Faint Attack (disappears, then reappears somewhere else, determined by controls)
B+Forward: Fury Swipes (does damage, immobilises opponent)
B+Down: Slash
More to come.