Pokemon Mystery Dungeon OCs! Scorch and Zest the Scovillain, Luster the Morgrem, Ark the Eevee, Mallow the Raichu, Brine the Dewott and Aria the Amaura!

This team is actually a combination of three different teams. Scorch & Zest and Luster are Team Treasure, explorers. Mallow and Brine are Team Miracle, rescuers and Aria by herself is Team Aurora, explorer. Ark hired all of them to help in their mission to save the world.
But unlike typical PMD stories, Ark isn't a human turned Pokemon. Ark was actually created by Arceus to work as its vessel. Arceus saw the world was in danger but couldn't enter the world of mortals so instead it made Ark, imbued them with special powers and sent them on their way.

Ark's special powers are that they can evolve into any eeveelution, they just need to be in contact with a Pokemon of that type. Like touch a fire type to evolve into Flareon. The evolution is always temporary and then they go back to being an Eevee. They can also call upon Arceus' power and use Judgement but this is very taxing on their body and is only a last resort type of thing.
Because of their evolution ability, they hired these Pokemon specifically for their types.

Scorch & Zest - he/him, they/them
Luster - he/him
Ark - any pronouns
Mallow - he/him
Brine - she/her
Aria - she/her