On Platinum, I got to 70-something in the Battle Arcade with this team, I don't have proof right now as I don't know how to exactly use a camera with a computer (lol) but I'm not looking to be on that list anyways, so it wouldn't matter; I'm just saying the team I used :P
My team was
Scizor @ Depends on the board result
Obligitory Choice Bander. Not much to say about this, as EVERYONE knows how it works. :P
Salamence @ Depends on the board result
252Spe/216Attack/40SpA I think
MixMence, a DD'ing one. Not much to say about this either, just setup and sweep.
Starmie @ Depends on the board result
Boring unoriginal team, but it was needed to get that far into the Arcade :L if I could use awesome Pokes like Dunsparce to get that far, I totally would..