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This was the team I used in my last Colosseum run, it was honestly the most fun I've had in a while because always having double battles allows you to build a team with a central strategy/theme. In this case my strategy was benefiting from the sun. Even with the very thin selection of Pokemon in Colosseum it's still a game I go to first if I want to build a new team with a fun strategy.
Also I didn't know this until I did this playthrough but the move Moonlight heals more HP when the sun is up. I always thought it would less with the sun up.