TR13

TR13 teaches a move to a compatible Pokémon in Pokémon Sword & Shield. Technical Records are consumed after use, but can be re-bought from Watt Traders. TR13 is Focus Energy.

Game descriptions

Sword, Shield:(Watt Trader - 1000W)
Sword, Shield, B.Diamond, S.Pearl:The user takes a deep breath and focuses so that critical hits land more easily.
Scarlet, Violet:The user takes a deep breath and focuses so that critical hits land more easily.