If the names of the two main Pokemon go together well (Luxchomp, Reshiphlosion, etc.) it's fine to call it that. If they don't go together well (Garchomp/Altaria, Darkrai/Hydreigon) then just call it Pokemon 1/Pokemon 2. Not FluffyChomp, GarTaria, AltChomp, or anything to do with the attacks or...