Hello, I'm new to this game and when i got to this point I really wanted to beat that Garchomp,so I came up with the plan to use Pyukumuku.Primarily their innards out ability. I made a team of them and let the Garchomp Ko them since their abilities are dependent on the opponents attack.They kill it easily,it was actually kind of funny having these cucumbers kill a dragon on a volcano.So i just wanted to share this way of killing him,since i see a lot of hard grinding methods,or methods that take a lot of time.
So ya:
4-6 Pyukumuku with Innards out ability.It doesn't matter their stats,or ev's or iv's. Just let the cucumber's kill a dragon.
Hope this helps anyone who wants to kill that bastard but don't have the time or patients to grind and train a hundred time over.
I am talking about the fight with his lv 75 Garchomp on top of the volcano.