dude, once they get like 40%, then you could use Pichu's downsmash and they go flying! anything 64% is death if you know what you are doing...Pikachu's doesn't get as good of recoil...
besides, Pichu flops around cutely!
I really prefer the way Pichu plays as opposed to Pikachu...
the only moves you should use that damage you are your smash attack, thunder (if they are in the air), quick attack (to survive), and skull bash (in 4P matches, when foes are distracted, good charge, deadly knockback)...your down smash doesn't hurt you, and back throw doesn't either...his aerials are ok, but they hurt you...