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 legends that appear in any Pokédex order, are allowed into the many Battle Towers and other battle facilities. They are also the only Pokémon with base stat totals of 580, besides the Swords of Justice. The mascot trios, whose name comes from the fact that all of them are game mascots, are not allowed in the Battle Tower and are found closer to the end of the Pokédex in the generation of their release.
Five of the eight trios share at least one type (the weather, beast, and regi trios all bearing different types from each other), and members of a trio will also commonly share an Ability and base stat total (the Forces of Nature, the weather trio, and the Tao trio being different due to inclusion of a third member who is either superior or inferior to the first two for story purposes). All of the trios have a master who created them according to myth and/or is somehow able to exert control over them, though oftentimes, these masters are not introduced until a later generation or revealed to be the master until a third version.
The term fell into official usage from the Shiny Legendary beasts' Wonder Cards.
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.
- Every core series game mascot since Suicune, excluding the mascots of remakes and X and Y, has been part of a Legendary trio.
- Mewtwo is the only Legendary Pokémon with a base stat total of over 600 that is not part of or related to any trio.