As you’re surely aware, Pokémon is serious business in Japan, with tournaments and competitions for the myriad playable variations so viciously competitive that many resort to illegally acquiring and modifying Pokémon.
In that sense, it’s odd that one of the most valuable pieces of Pokémon memorabilia, the Pokémon Illustrator card from the Pokémon Trading Card Game, serves absolutely no in-game purpose. It is, however, considered to be one of the rarest Pokémon cards in existence.