And by this I mean . . . for the games you own, which Ability do you do the most damage with?
For Kirby Super Star Ultra, I'd have to say that when I'm not abusing Rock into the dirt, I prefer to go Suplex. That's right, I rock out with Suplex. FUN FACT: WHEN YOU ARE GRABBING AN ENEMY OR MINIBOSS-GENERATED STAR, YOU ARE INVINCIBLE. Also, several bosses which were originally either taxing or tedious quickly become easy (sometimes laughably so -- try doing the B+B move on one of Lololo or Lalala's chests, watch their HP plummet; alternatively, up-throw a Waddle Doo into Kracko for massive damage, or grab the Computer Virus's projectiles and throw them when it's your turn to be relatively invincible).
For Kirby Squeak Squad (yes, I played that), I ruled with Ice-Bomb and Ghost (yes, Ghost; there's something about possessing enemies and forcing them to mercilessly annihilate their former-and-maybe-still friends makes me feel all warm inside, I don't know why).
As for Kirby 64, gosh how I love that . . . I have recently discovered the two-handed awesomeness that is Fire+Cutter, or as I call it . . .
"Kirby has now become Highlander Kirby!" . . . Highlander Kirby. Or Zweih?nder Kirby, one or the other. While the sword is out, YOU CAN TURN AROUND TO KILL PEOPLE. It is that easy. When I first tried it, I thought 'oh, OK, it swings kinda slow, doesn't . . . OK, let's try something else' and forgot all about it. Now that I'm playing it again, I'm loving every second of the power. Alternatively, Bomb+Bomb is some nice homing-projectile action (reminding me just why I loved the heck out of Reimu-A in EoSD).
That said . . . let's hear some of your tales of ownage! What's YOUR best Ability?