if kirby used one of the super abilities in kirby;s return to dream land as a final smash:
ultra sword: it should change everytime like it does in the game: fish, ninja stick, sword, axe, etc
ultimate flame: would be similar to ssbb mario's final smash... seems clone-ish
ultra beam: would work similar to ssbb pikachu's final smash, another clone
snowball: unique, not sure how it would work. player rolls around the stage and if people get caught in it, the player can press A to explode the snowball sending everyone stuck flying, and if anyone was not caught, they could get hit by the snow fragments.
grand hammer: another unique one, would have to press A at the right time, and each successive timed button press would increase the size of the hammer, therefore increasing its size, damage, and range.
mike kirby: seems like aclone of that assist trohpy who plays the guitar damaging people too close... another clone, although could be changed to the kirby's return to dreamland mike kirby although only used once instead of 3 times
crash kirby. EPIC reminds me of ssbb jigglypuffs final smash if jiggly exploded instead of deflating.