>>55126712Dragon Dance would be a start. Maybe give Garchomp a better ability, too. Dry Skin, Multiscale, Sand Rush, Sheer Force, Tough Claws, Strong Jaw, Intimidate, Defiant, Shed Skin, Unburden, and Moxie all fit with it thematically and would save it from falling off for a bit. If you wanted to future proof it, Speed Boost would ensure it falls off around the same time Mewtwo and Rayquaza do.