The following will need a sapphire or ruby and fire red.(you will need lots of legendaries... which i got!)

Rayquaza lvl 100. Thunder, ice beam, earthquake, ancient power. (with leftovers)
Groudon lvl 100. Eruption, earthquake, slash, solarbeam. (with quick claw)
Kyogre lvl 100. Waterspout, earthquake, ice beam, thunderbolt. (With Sea incense or any water bonus)
Mewtwo lvl 100. Pyschic, shawdow ball, solar beam, focus punch. (with leftovers)
Articuno lvl 100. Blizzard, ice beam, rock smash, and fly. (with nevermeltice)
Tyranitar lvl 100. Crunch, earthquake, thunderbolt, Iron tail (with black glasses or quick claw)

I never lose with this amazing team!!! Im like a master at my place but 2nd. cause my friend uses glitches. I dont and u can change the thunderbolts to thunders if ure pkmn has high special atk. This is the Best!!!