Villain Team in Gates to Infinity?

Question

Why is PMD: GtI is the only Pokemon Games that do not had Villain Team? Like PMD: R/BRT is Team Meanies and PMD: EoT/D/S is Team Skull. If it's not the only one, then what is other Pokemon Games that do not had Villain Team?

Answer 1

There's essentially Team Munna, but it's not an official name.

Munna, Toxicroak, Glameow and a few others (some Chandelure and Excadrill I think) are the "team" antagonists in the game, but they are also directly linked to the "boss" of the game (no spoilers as to who it is).