Species: shadow lugia
Shadow Lugia, also known as XD001, was originally a Lugia before being corrupted into a Shadow Pokémon. Unlike other Shadow Pokémon in the Orre games, Shadow Lugia's colouration vastly changes to an inverted variant, which consists of dark purple and dark grey, as well as gaining several tweaks to their appearance.
This tag implicates legendary_pokemon, shadow_pokemon, generation_3_pokemon (learn more).