Where can you find shadow mightyena on Pokemon Colosseum?

Shadow Mightyena is not available in Pokemon Colosseum.

Here's why:

* Shadow Mightyena is introduced in Pokemon XD: Gale of Darkness. It is a Shadow Pokemon you can capture and purify in that game.

* Pokemon Colosseum features a different set of Shadow Pokemon. You can find Shadow versions of Pokemon like Entei, Raikou, Suicune, and others.

If you're looking for Shadow Mightyena, you'll need to play Pokemon XD: Gale of Darkness.