These are the strongest attacks for each Pokémon type. (Updated April 27 2012)

Type Moves
Bug MegaHorn
Dark Foul Play
Dragon Roar Of Time
Electric Bolt Strike
Fighting Focus Punch
Fire Blast Burn, Eruption
Flying Sky Attack
Ghost Shadow Force
Grass Frenzy Plant
Ground EarthQuake, Fizzure
Ice Freeze Shock, Ice Burn
Normal Explosion
Poison Gunk Shot
Psychic Psycho Boost
Rock Head Smash, Rock Wrecker
Steel Doom Desire
Water Hydro Cannon, Water Spout