I am considering making my first cash shop purchase soon, since my birthday is coming up. Treating myself and all that! :D What does the Shop Talk: Apocalyptic Apothecary item in the shop do?

[item=Shop Talk: Apocalyptic Apothecary]

is a book. You can read it to your pet to increase his/her intelligence.

But bear in mind ANY book will increase your pet's intelligence, including the cheap ones in the Book Nook, so there are wayyyy better options (aka less $$) out there than the cash shop if your goal is simply to start making your pet smarter.

Thank you for your reply! I will not purchase that book. I thought maybe it gave the shopkeeper dialogue or something, but I will purchase other books instead.