Kirby is on of the three midgets in Smash, and he has one of the most devestating attacks of all.  The stone formation is unstoppable, and your only defense is well, moving. Eat people by pressing B and then steal their "B" powers by pressing down. Try to eat Falcon or Donkey Kong, because they both have extremely powerful B attacks.  His spinning kicks are great too.  

B: suck in characters (Down after eating gives you power)

B+Up: sword cutter combo

B+Down: rock formation

A: puff punch

A+Up:

A+Down

A+Over

A+Running: side kick