>>53880337Slowbro with Block, Recycle, Heal Pulse, and Slack Off. It's Oblivious to prevent Taunt and holds a Leppa Berry.
You trap something with Block, then just wait. Recycle to get your Leppa back and recover PP, and use Heal Pulse on the opponent when they get down to Struggle so they can't die. It makes an unwinnable battle for both participants.