Rate my pokemon diamond team?

Don't bother bout what the others say bout your pokemon. Just bring with you any pokemon that you feel comfortable with. It will have no meaning if you bring pokemon that you don't even like. I have a solution to solve your fly problem. Let giratina forget giga impact pr hyper beam and let it learn fly. Heatranm is a powerful pokemon but you have too many fire type move on it. i suggest earth power and dark pulse to replace heat wave and lava plume. if you wana keep heat wave then forget magma storm. its accuracy is unreliable. moreover, heat wave hits two opponents so it should be useful in a duoble battle. Dialga's moves are good but you should forget draco meteor and let it learn earth power, ice beam or thunderbolt. You my be tempted bt draco meteors high base power but you must always remember the recoil effect. Dialga will be virtually useless after its sp.atk drops two stages. Garchomp should learn earthquake instead of dig. Groudon is just perfect. I give your team 10/10.