The use of external devices to alter the Pokémon in a player’s party is expressly forbidden. Random checks will be performed throughout the tournament to determine whether or not an external device has been used to modify a player’s party.
Sure my whole party might have perfect IVs but thats not impossible without an external device. So long as the pokes are legal no machine they pull out can tell if the pokemon wasn't edited?
maybe I'll put a few IVs that aren't as important in the high 20s lol