@saltwater ( I think we should do this to reduce confusion)
I would say give rain dance to Delphox, it should be able to get that up. If your Seismatoad has swift swim, it has should have the potential to sweep with Surf.
Also, with the rain up Solarbeam won't knock out your Golem right away. And if it has sturdy it can bring a lot of Char's pokemon down with earthquake, although I think Volcarona should be able to take one and it doesn't affect Rotom. Stone edge will help with them.