TR48

TR48 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. TR48 is Bulk Up.

Game descriptions

Sword, Shield:(Watt Trader - 2000W)
Sword, Shield, B.Diamond, S.Pearl:The user tenses its muscles to bulk up its body, raising both its Attack and Defense stats.
Scarlet, Violet:The user tenses its muscles to bulk up its body, raising both its Attack and Defense stats.