Heres a team that can beat the Elete Four like that!

Lugia(from XD) Lv. 81+ fly, recover, dive, surf
Groudon Lv.88+ hyper beam, dragon claw, cut, earthquake
Rayquaza Lv.84+ protect, dragon claw, hyper beam, solarbeam
Blazeken Lv. 83+ sky uppercut, bulk up, fire punch, secret power
+ 2 other ones