Legendaries ?

Is there such things are legendaries in this game ? , if so what arks would they be ? Hatchlings ? Destructor ?

Those would be the first ones

The rest are just rare

Pretty much. The story made it clear that the first ones are the ones who have complete control and can end things in an instant. Pretty much screams legendary.

Would they ever me catchable ? As a real ark that u can put in line up or they gonna stay as a fourth ark

Fourth Ark for sure

I doubt well see them as legit legendary Arkadions anytime soon

Gotta get past the other stuff first