Holy crap he is hard to encounter. I am running around on the beach in Hasberry plains outside of Dollet (like everything says do) and all I have encountered ever is Fastilicons. Is there a better place, or something I can do to better my chances of success, I need some Adamantine.

Refine Vit Ups by buying Vit-J Scrolls and using Eden's GFAbl Med-RF to Refine 10 into 1 Orihalcan, then Refine 10 of those into 1 Adamantine. Assuming you are that far in the game? Alternatively... Adamantine can be stolen from BGH251F2 in FH.

Btw, Google is your friend.

Try Long Horn Island.

You can also occasionally find this monster on some of the beaches near the Timber area. This is a little known secret that can be helpful on earlier discs when you don't have access to Long Horn Island. BTW --- Long Horn Island is an island shaped kind of like, well, a horn just above the Galbadia continent, the one that Timber and Dollet are also on. When you land on it, your location indicator in the menu should read "Dollet - Long Horn Island."

lol yea I have finally been encountering him, thanks for the tip, only they are hard as hell to kill. I encounter 2 at a time, steal my stuff but then I usually have no choice but to run.

Try using Quistis's Blue Magic Degenerator or Missiles, protective magics on your characters, or anything else to turn the tide. Alternatively --- what you're doing is probably fine as long as you can get what you need from stealing.

You can find them in two places

1. on the very tip of long horn island

2. ultemeicias castle mwa haha