Wetland hunter is an O.K. pet but I seriously suggest the gauntlet farming idea. my brother was lucky and got a foo dog from my MSP gauntlet and a Coldfire Dragon is a very good pet too (my brother hatched for one) I don't really know about the Rude Goblin though, but my brother hatched one of those, too. Anyway, I wish you the best of luck farming if you want to!!
PS: Defeating Astreaus (Celestia boss, he is in a dungeon after a couple tests) drops Sea-Dragons. I know many people have successfully farmed this pet multiple times so I would not call it that rare. plus it has the highest base pedigree of all pets and can learn some extremely good talents. I would try farming for this, too