Paralysis is this things worst enemy, and so is poison. Although toxic poison is best, regular poison will do. Then all you have to do is stall it out. Dry skin would be helpful... Also keep in mind that special attacks won't do crap against it. Leavany would be amazing if it could land a leaf blade, but sheer cold is a thing and I can't remember uf it has ice beam or not. Fake out can buy you more stalling time, and Hitmonlee and Swampert can deal some good physical damage. Provided they can survive a tidal wave.