Bandit on both Diamond and Pearl.
I first started using that name on Mario Kart DS, because I didn't have any idea what to use as an online name because I never played any games online before, and wanted something new.
So since it was a racing game, I named myself Bandit, after Burt Reynolds character in "Smokey in the Bandit",
Eastbound and Down
Loaded up and truckin'
We're gonna do what they say can't be done
We've got a long way to go
And a short time to get there
I'm East Bound, just watch ol' Bandit run
And I've used it since on everything. When I go with a non-Nintendo game such as PSP, I use BanditoZorro and BanditoZorroGK.
And I'm awesome.