How do you beat Diddy Kong in Mario strikers charged?

Same way you do with any one else to beat Diddy. Even Petey

Goalie Camping,

Get a Boo on your team. Deke past the goalie for a goal. Then get someone on your team and get next to your goalie. That way when someone get near you Kritter will kick him/her. If you do this right you shouldn't have to start over. Good Luck