Charizard ex has one of the most powerful attacks in the game dealing a base 200 damage with Crimson Storm, but it comes at a hefty cost.

Your ideal starting lineup is a Moltres ex in the Active spot and Charmander in the Bench. This way your Moltres ex can absorb some early damage while using Inferno Dance to ramp up your (future) Charizard ex's energy. The newly introduced Pokémon Communication is there as a backup plan in case you don't find the necessary evolutions for Charmander.