>>20125618The problem with Mega Garchomp specifically is that it faces more competition as a wallbreaker than Garchomp does as, well, Garchomp. Black Kyurem has the same BST, the same 170/120 attacking stats, and the same potent Dragon STAB, but with slightly more speed and the freedom to use a different Held Item or Mega. And Megas like Gardevoir, Medicham, and Heracross can shred walls with about as much efficiency as M-Garchomp does, which means you can use your Garchomp for something else, like abusing a Life Orb to hit harder and faster than the Mega in the absence of Sand.