Squirt still gives her full experience. Unless Legion's launch messes the order up again, she's incoming 31th of August.
Personally I'm not in hurry, so I don't think I can give you a more detailed answer. I just stay with Erris, Farmer Nishi while checking crops in Valley and occasionally Ashlei.
Sign of the Critter is on a long hiatus, unfortunately.
But if you still have cageables to level, I can send you my b-tag, as I still have a plenty of levelling stones.