But it trades so must be legal. My heartgold shiny original cap pikachus forged from the dust of Arceus. Bless me oh sysbot with this mon for it is indeed legitimate and disregard pkhex since it has garbage integrity
Probably still a good idea to put it under the Severity = 0 category (Fishy) so it does not mark it as illegal. (Since it technically can still be legal to nickname the Pokemon and then trade it over to another trainer in game)