Well, all right. I got the Toxic Orb at the Battle Frontier, so a Leftovers and an Earthquake (if you have it) would work.
If you don't have an Earthquake, then perhaps the VGC09 Milotic?
Edit: You already have the Bulbasaur, don't you? So we'll just trade for the Totodile then, unless you still want the Bulbasaur.
My top priority right now is TMs, although the Leftovers would also work if you don't have Earthquake.