Pokémon Ruby Version, Sapphire Version, and Emerald Version - Markings
Each Pokémon includes a set of markings, which can be either on or off.
Markings can be set in the Pokémon Storage System and will appear in the
Storage System and in a Pokémon’s Summary screen, among other places.
Markings have no effect on game play. A Pokémon starts with all markings
off. The markings used before Pokémon Diamond Version and Pokémon Pearl Version are circle, square, triangle, and
heart.