From WiKirby, your independent source of Kirby knowledge.
Pacto is a big yellow hovering enemy that debuted in Kirby's Dream Land 3. It vaguely resembles Pac-Man, but possesses a single big, round eye and red teeth. If it catches Kirby in its mouth, it chews him up and spits him out again, similarly to a Peloo or a Maw. Due to their inability to be inhaled, Pactos cannot grant a Copy Ability.
Kirby's Dream Land 3
Pacto makes its debut appearance in this game. It is not a terribly common enemy, but its look and behavior were established in this title.
In Kirby's Dream Land 3, Pacto can be found in the following levels and stages:
Kirby: Canvas Curse
Pacto appears as an invulnerable hazard in Kirby: Canvas Curse, where it jumps out of pits constantly to eat anyone who closes in on it. Pacto attacks much faster in this game than it does in the main series.
Kirby's Return to Dream Land
Pacto also appears in Kirby's Return to Dream Land, where it is found only in the Raisin Ruins level and is identical in its attacks from its last appearance. However, there is a cloudy version of a Pacto found in Nutty Noon known as a Pacloud.
Kirby: Triple Deluxe
Pacto makes another appearance in Kirby: Triple Deluxe, with identical functionality to the previous appearance. This time, however, its alternate variety is found in Wild World and is a flowery variant called a Pacflower.
Kirby: Planet Robobot
Pacto has since reappeared in Kirby: Planet Robobot, serving the same purpose as before, though this time with no alternate variant.