Wow, that is a great idea, I only thought of CB T.rex earlier. I think DD Shuca works better and there's no regular Groudon, ferro isn't too common and you can go for Fire Fang. Free Head Smash spam. Bad news is Tyrantrum is slow :( Even with Jolly +1, Mewtwo Y outruns you. I will go for Jolly because you outrun many Yveltal and Xerneas with it :D