Galarian Farfetch’d Details

LeekHolding it makes critical hits more likely, and boosting Attack with Swords Dance before attacking — a physical attacker build. Its ability Defiantmeans its Attack rises even when the opponent lowers its stats, Intimidatemaking it a strong option against them, among others.

Alternative Move Options

First Impression or Quick Attack are also options

Swords DanceInstead of that, the priority move First Impression or Quick Attackis also recommended. You'll lose the breakthrough power from setup moves, but you'll be able to reliably finish off weakened Pokémon.

Role of the Leek Critical Hit Attacker build

Watch for an opening, use Swords DanceSwords Dance to boost Attack before attacking — that's the basic gameplan.LeekCombined with Leek, it guarantees a critical hit — Slash or Leaf Bladeusing it as the main move, while also relying on the high-power Brave Birdto force a breakthrough as well.

Threats

Steel-type Pokémon with high physical bulk that resist its moves

Since Normal-, Flying-, and Grass-type moves are resisted by Steel types, Steel-type Pokémon with high physical bulk are hard to break through. Mega Metagross and Corviknight in particular have no effective move against them, and may knock it out with a counterattack, so be careful.