From Bulbapedia, the community-driven Pokémon encyclopedia.
A legendary trio is a term used to describe a group of three closely-related legendary Pokémon. Legendary trios can be subdivided into two tiers, normal trios and mascot trios. Normal trios, which are always the first legendaries that appear in any Pokédex order, are allowed into the many Battle Towers and other battle facilities. They are also the only Pokémon whose base stats total to 580. The mascot trios, whose name comes from the fact that all of them are version mascots, are not allowed in the Battle Tower, and are found close to the end of the Pokédex in the generation of their release.
Many trios, in addition to sharing at least one type, will far more commonly share their ability and base stat totals (though Rayquaza, Landlos and Kyurem do not with the other members of their trios). All of the trios have a master who created them and/or is somehow able to exert control over them, though oftentimes these masters are not introduced until a later generation.
List of legendary trios
- The lake guardians are the only trio whose members are all the same type. However, many other trios share types within the group.
- The lake guardians are the smallest sized trio among these groups.
- Lugia and Ho-Oh are the only legendary version mascots to not be part of a trio, as Suicune, the mascot of Pokémon Crystal, was already part of the legendary beasts.
- Mewtwo is the only legendary with over 600 Base Stat Total to not be part of, or even related, to any trio.