I think I feel the same way Crystal Clair does. ^____^
I picked Jessie/James and Cassidy/Butch. They hate each other, Jessie and James do anything they can to mess up their plans, and they're always competing.
In second I think is May and "the green haired kid" whose name is Drew. ^-^ They have a pretty decent rivarly too. Ash and Gary didn't last that long, and they only battled against each other like twice. >o< I think that if the writers wanted, they could make Ash and Misty rivals, and they sorta are, but with different goals in mind, they can't really compete against each other in the same manner. Maxie and Archie, meh, um, I guess they're okay rivals, but you just don't get to see them much.