I do have a couple issues, one's minor, and one's somewhat major...
the first one, as in, the minor one is that there probably wouldn't be stairs. A slope upwards, maybe, but not stairs.
The second one... pokemon speak and write in English (this is not only just convenient, it makes sense, given that Unown exist, and could have/ would have since taught them the language.) I understand that you don't want the book to be read at this point, and that's fine, but maybe you could make it old to the point of near illegibility, instead.