Where i can catch this monster? (Gaiawyrm, hydrowyrm…)
You cannot catch them, you can only catch their first evolution.
Location for the hatchlings is four spots above agramis.
First - leafy
Second - ashie
Third - bluey
Fourth - galey
Their final evolution are the wyrms you are looking for
The spawn rate is 0,5% so u need to farm for hours Before getting one