just buy a fake one at the market if you can't get back into noer take the cave in the north west part of the forest and sneak back in through the sewers so you can buy a fake id as for transform into seawitch you need to meet seawitch first as a stinky human and do her quest then talk to her again
you need to be rebirthed as pre deepone if your lona doesn't look like the following picture you can't even unlock seawitch form since you aren't a seawitch as far as where our fishy friend is located she is located in the dungeon temple to the east of fishtopia about 7 or 8 tiles to the right of the town