I think Memory Out will be pretty game-breaking. Just imagine shutting down Flare Blitz, Upstream, Concerto, Psychic Pulse, and all other Pokes with only 1 good attack. And that without attacking...wow. Sounds like free Paralyze, only better. Too bad it needs to be damaged/KOed, but that shouldn't be that hard. xP
Downer Material is of course also key to winning matches, it slows down every single deck out there. Upper Material is just worthless, changing a 1 to a 0 only really matters in programming language, not in Retreat Costs. xP
HOWEVER. Using his Tele Burst to switch to Uxie, let it get damage and finishing the opponent off with a random strong Psychic Poke would be an awesome idea.
And since the Bodies only work when all 3 are in play, they're just meant to be together. "No matter how you toss the dice, it's meant to be" Funny thing about this lyric, tho. It would actually matter how you toss the die, since you obviously want to start pwning starting with your triangle. Just imagine, a Delta Draw for 2 Colorless xP instant torture.