Running 1 of each Garchomp seems to work best for me. Happiny is really good at breaking into important numbers and putting pressure on opponents early. Generally want to go Happiny -> Reckless Chomp -> Stealth Chomp or just straight into Stealth Chomp when a kill is available. Can hit 170 / 190 with Happiny + Cynthia. Cape is very important. Susceptible to Sabrina.