I found where a mine spider can be !

But I never had the chance to catch it what the ???

It was north of crescent island

probably summoned by something.

Gargol: Reincarnate- spawns a random monster

Maybe it was summoned by another arkadion? Only reason i could think for it being un-catchable 

Haha now that would explain it ! I’m watching walking dead and farming and I must of missed that sorry guys !

The same thing happened to me with a vegitiger and i got really excited until i realized i couldnt catch it

same here, i wasnt looking and one of them summoned the first evoulotion of coldheart  and i freaked out, got so excited, then noticed i couldnt catch it