Pokémon Sword and Shield have British Slang.

Pokémon Sword and Shield’s setting is based on Britain is really no secret (unless you live under a rock :) ), but it is more than just the game’s geography and architecture it also shapes their dialogue.

According to Gamespot, Sword and Shield refers to your maternal guardian not as the American ‘Mom’ but as the British (and therefore correct) ‘Mum’. Your dad, it would seem, is as absent as ever, but otherwise I could only hope that he’d be referred to solely as ‘yer da’, and would spend a lot of time getting angry on the internet.

There is British slang though out the game “little chaps” and characters being “pants at directions.”