I say Groudon, and charizard. charizard is immune to earthquake, gains bonus from groudons ability, and mixed with STAB,, and its own ability its flamethrower is very strong. charizard also can learn a good variety of moves, like dragon claw, etc. Charizard helps groudon by getting rid of ice types, while groudon gets rid of rock types, and cancels out water's 2x weakness to both. these 2 have very good stats btw and complement eachother very well.