My team included:

Dewgong lvl:57 MOVES:
Ice Beam,Surf,Sheer Cold,Hyper Beam

Nidoking lvl:55 MOVES: Flamethower,Earthquake,Megahorn,Rock Slide

Gyarados lvl:60 MOVES
Fire Blast,Hydro Pump,Thunder,Hyper Beam

Charizard lvl:62 MOVES
Flamethrower,Dragon Claw,Hyper Beam,Blast Burn

Primeape lvl:52 MOVES
Cross Chop,Hyper Beam,Focus Punch,Brick Break

Pidgeot lvl:58 MOVES
Fly,Wing Attack,Hyper Beam,Featherdance


These pokemon were un beatable and i never used any items. Also i still had not caught Mewtwo and the Elite 4 were still weak.