I thought poison jab is a viable move for Garchomp. I think a fairy killer set should be implemented :) :
Fairy Killer
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move 1: Swords Dance
move 2: Earthquake
move 3: Poison Jab
move 4: Dragon Claw/Outrage
ability: Rough Skin
item: Lifeorb / Lum Berry
nature: Jolly
evs: 4 HP / 252 Atk / 252 Spe
Move-set is pretty self explanatory. Earthquake is to counter mawile/mega mawile and klefki. Posion Jab is for the rest of the common OU fairies (Azumarill, Gardevior, togekiss etc). And Dragon Claw is a non-locking stabbed attack.
Fairy Killer
########
move 1: Swords Dance
move 2: Earthquake
move 3: Poison Jab
move 4: Dragon Claw/Outrage
ability: Rough Skin
item: Lifeorb / Lum Berry
nature: Jolly
evs: 4 HP / 252 Atk / 252 Spe
Move-set is pretty self explanatory. Earthquake is to counter mawile/mega mawile and klefki. Posion Jab is for the rest of the common OU fairies (Azumarill, Gardevior, togekiss etc). And Dragon Claw is a non-locking stabbed attack.