I've made so many Mega Evolution concepts, but I never touched Farfetch'd. Look at those stats- he's just a Diggersby here. It's not you- nice design by the way- but I think Farfetch'd needs a regular Evolution first. Then we an talk Mega Evolution.
Mega Farfetch'd would end up being used more than the stupid bird Talonflame if it were to exist.
Farfetch'd @ Farfetchite
Ability: Defiant => Huge Power
EVs: 4 HP / 252 Atk / 252 Spe
- Swords Dance
- Brave Bird
- Close Combat (New Egg Move from Staraptor, Primape, Zangoose, Infernape, and Lucario)
- Night Slash
Farfetch'd was once an outcast of a Pokemon, tormented by its horrible stats. However, when it gained its Mega Evolution, Farfetch'd took its place as the third strongest Pokemon, just short of two other Huge Power Mega Evolutions in Mawile and Medicham. Mega Farfetch'd is a lot like Hawlucha, having access to Swords Dance, being a Fighting and Flying-type, and having good Attack and Speed and being rather frail. However, where Hawlucha is a threatening sweeper thanks to Unburden, Farfetch'd works more as a wallbreaker, being decently fast, but not quite fast enough. Brave Bird and Close Combat are two of the strongest attacks in the game, and after a Swords Dance boost, will be ripping apart most Pokemon in their wake. Night Slash complete's Farfetch'd's type coverage by allowing it to get a super-effective hit on Aegislash. It is worth noting that after STAB, a resisted Brave Bird or Close Combat hid harder than a neutral Night Slash, so it's best to stick to the STABs most of the time.
Replace Night Slash with the most overpowered move in the game, Knock Off. You know how badly that screws over other Pokemon? That, plus the fact that it hits harder than Night Slash when knocking off an item.