Ability bubble

Ability bubbles are items in Kirby Squeak Squad. They can be collected and stored in the item pallet. With the touch of the DS stylus, you can pop the ability bubble to get a copy ability, or spit them out.

You can even use the stylus to mix two ability bubbles together to get a predetermined ability bubble. But when Sword gets its copy scroll upgrade, you can mix it with another ability to get a true combo ability (i.e. Sword+Fire or Spark or Ice). The same thing is true with Bomb (without Fire, though).

There is even a copy ability called Bubble, where Kirby can turn his enemies into ability bubbles.

Also, one of the methods of getting the Ghost ability is by mixing two Sleep bubbles, but only if you obtain all the Ghost Medal pieces.