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Type change Farfetch'd to Flying/Fighting.
Hidden Ability is now Super Luck.
HP: 72 (+20)
Attack: 98 (+38)
Defense: 78 (+23)
Sp. Atk: 50 (-8)
Sp. Def: 77 (+15)
Speed: 130 (+70)
Total BST: 505
Now learns Sacred Sword.
Honestly, I'd rather this be an evolution, as the whole point of Farfetch'd is that it's a duck stupid enough to wander around with everything you need to make it into a good meal. Let it learn Lucky Chant at a high level and evolve when it knows it, similar to some of the Gen IV cross-gen evolutions requiring Ancient Power to be known first.
Conceptually, it would be the duck lucky enough to not get eaten and plucky enough to learn how to fight and defend itself properly from hungry predators via its mastery of kendo.