Garchomp/altaria doesnt need anything aside from holos from drx and will be a great cheap deck to play until the tins get released.
Not really. 4 Garchomp and 4 Altaria are 80$. 2 Mewtwo are 60$. It would be cheaper to build Zekrom/Eelektrik than it would be to build Garchomp/Altaria...