Probably Takuro the Axew, Guertena the Smeargle, and Martena the Butterfree.

I suppose we could at least make it interesting. Martena has a couple of stat-effect stuff, and Guertena has Reflect. It'll probably still be a curb stomp, but at least it'll be marginally less of one, and we can do a dragon vs. dragon deal. Takuro also has Leer and Scary Face. In the end, it'll probably all be going all out against one holy-shit monster, but hey.