His true motives are hardly mentioned until the very end of the main story, where it is revealed that he really wanted to steal the Master Crown from its guardian, Landia. After he succeeds, he tries to conquer the universe, starting with Pop Star. Fortunately, Kirby and company are able to stop him.
After his defeat, he surprisingly tries to make amends with Kirby.
He starts by building an amusement park for the puffball's 20th anniversary, and he continues to provide support for future adventures, including running a shop in Team Kirby Clash Deluxe and being a Dream Friend in Kirby Star Allies.