Majin, take a Jigglypuff. You must evolve it immediately with the moon stone found in mount moon. It may not know (until possible) any attacking moves with a BP under 100. Just so you know: Double Edge, Focus Punch, Blizzard, Hyper Beam, Solarbeam, Thunder, Fire Blast, Overheat, Dream Eater and Mega Kick. Mega Kick is available right when you leave mount moon. You could make a damn good Sunny Day set with those moves.