Pokemon XD - Can you beat Orre Colosseum with no outside Pokemon or items?

I really like Pokemon Colosseum and XD. These two Gamecube games are weird, gritty, unique entries in the series that radically change what Pokemon could be while maintaining the core games' battle mechanics. With a focus on double battles, which would later become the official competitive format, it allows you to work with a litany of new options in battle.

Nowhere is this more apparent than the post-credits challenge, Orre Colosseum.

As a kid, I never got anywhere close to beating this. I think as a grown-ass man, I probably can. In fact, it'd probably be easy when you know their movesets and how to make good Pokemon. So to make it interesting, I want to see if it's possible to take this final challenge on using only what Pokemon XD provides.

No outside Pokemon, not even the same species but with egg moves. No outside items, whether unavailable or only found once in XD itself.

This is a WIP article because I'm too lazy to move it into another folder

I'm thinking of making a stream project out of this, from my actual Gamecube

but I gotta find out if I can make my old Dazzle work on this laptop...

_