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Each of our Generations has certain types of Legends included in it. The GSC-style archive has a Legendary Trio (the "Legendary Steeds" #PF011 Thundash, #PF012 Flamash and #PF013 Aquash), which are sort-of "ruled over" by #PF014 Slepnir. #PF150 Angelse is a Mew-like Legend.
In the RSE-style archive, #FA195 Ragnorilla, #FA196 Chimplague and #FA197 Despotutan are the Legendary Apes of the Apocalypse; they are ruled over by #FA198 Majestiti who keeps them dormant and unthreatening the way Rayquaza protects the world from Groudon and Kyogre's violent tendencies. #FA199 Iwraith is something of a Mewtwo-like legend, while #FA200 Specolor is another Mew-like.
In the DP-style archive, #DS048 Cognimech, #DS049 Drakoniric and #DS050 Nightmera are known as the Dream Beasts; in a reversal of the Groudon/Kyogre/Rayquaza setup, the first two Dream Beasts both guard the (hopefully) eternal prison of the Legend of Primal Fear. #DS089 Mercuik through #DS099 Eriscord are...we're currently calling them semi-Legendary. #DS100 Nukhelios is definitely a true Legend. We also have others in the works. Last year we held a contest to design some Wind-type legends which was won by patricol's designs Jibayuna and Bayubisa; they will be #DS199 and #DS200.

...also, all members of Pokémon Factory staff are legendary. Poryhedron is the Legend of Information.