Falconeir

I don't have anything with those moves. I have an Ivysaur that can tank a few hits from Tangrowth, but he can't do much damage. I have a Skitty that can do a lot of damage to him, but is 2 shotted by drain/acid. When he dies by drain, Tangrowth regains a good third of his health, and at that point, I'm left with fodder pokemon that will die before they can even get any moves off.

I can barely drop him into his red zone, but after that, he 1 shots my fodder pokemon with his mega drain, and brings his health up back to orange. I've been stuck on his fight for the past hour or so, and I haven't made any kind of progress on him.