>>36005887>>mythicals are not legendariesThey were, in English, up to Gen IV, but the distinction has always existed in Japan. In Gen V, they finally made the distinction in English.
Also, UBs aren't Legendaries. The official "Legendary Pokémon" says they're not.
>B-but they're legendary in the code!There is no such thing as "legendary in the code". You're thinking of non-Special vs Special (regular Legendaries and UBs vs box Legendaries and Mythicals). Saying UBs are Legendary is like saying Ho-Oh is Mythical.
>>36006059Fuck off, they didn't.
>>36005961Ditto.
Overall,
Legendary = Pokémon with typically high stats, often found in duos or trios.
Mythical = Like Legendary, but (at least initially) only available via distributions. Considered Legendary before Gen V in English, but always separate in Japan.
Ultra Beast = Pokémon with Beast Boost. Always a separate category in all languages.