Which Pokémon has been given the least amount of attention or special care from TPC? That means no first partner Pokémon, no Megas, no Dynamax forms, no regional forms, no babies or post-debut-gen evolutions, as little appearance in media as possible, only regular encounters (no events or gifts), no buffs, no signature moves or abilities etc.

I was going to say Glameow, as it has practically been on hiatus since it's debut gen in both the main games and the anime, but then I realised that they changed its model in Gen VII, indicating that some amount of shilling was attempted.