im not sure but i think its mew or arceus.
Ho-oh, introduced in the first couple of episodes of Pokemon
Technically, there was no FIRST. All the first-gen ones came at the same time.
Those being Mew, Mewtwo, Zapdos, Moltres, Articuno, and the semi-legendary Dragonite.
Arceus the legendary pokemon
you first have to catch/defeat the legendary pokemon cobalion in mistralion cave you catch virizion in pinwheel forest
sibasour dewana x
Victini is a Fire and Psychic type Pokemon; it is the first of its kind, too.
Arceus the legendary pokemon
It was mew (:
The dragon pokemon palkia.
you first have to catch/defeat the legendary pokemon cobalion in mistralion cave you catch virizion in pinwheel forest
its suicune, the water type dog
It is a rare pokemon, but it is not a legendary pokemon
sibasour dewana x
when you get your seventh badge and you will head for mount cornet
With the current event, Victini is the first you can get.
Ho-oh First Episode
there is four legendary Pokemon you could catch first you need seven bagdes go to the top of mt. coronet and beat Cyrus you will see the Pokemon palkia is a legendary Pokemon after that go to the lakes and you could catch azelf mesprit and uxie which are legendary Pokemon note-i did not use uppercase letters
Unknown is not a legendary Pokemon but it is considered rare. Legendary Pokemon are one of a kinds.