Unfair catch rates

Why are some evolution monsters so hard to get? And I don’t mean omegamid or what, I mean the 2/3 star monsters like the earth lamp. 5 tries and all I come out with is flame lamps! As well as the catch rate they’re stupidly rare too

Just wait for the elemental dungeon at the end of this week.

Ik that. It just seems really unreasonable