element crystals
I think The Sycamore was the only kind you couldn't catch due to it being a boss? But I think it drops rare eggs rather then giving you a egg for it.
And that Wealthy uh what's it called? The Cat doll. I'm not sure if it's super duper rare or you can only get the egg from a chance item.
I have really bad luck with eggs drops.
{ ★ } I remember the kindred name, it's sycamorte.
Aaaah, butts. I've only gotten one egg so far, and it's one of the toads at the beginning of the game?
I don't play much though.