Poké Job 33, Bookmark, “Help wanted finding books”, has the description: “We would really be grateful if Psychic-type Pokémon could come and use its powers to quickly search for the books we have in stock!” It doesn’t explicitly say it requires reading, but that seems the most likely way they’d find it. Admittedly, I suppose they could just read someone’s mind to see the look of the book and use telekinesis to carry it. That suggests some level of working memory and pattern recognition, though not quite reading.
The Pelipper Couriers Poké Job might require reading an address and tracking a map…unless the Pokemon follows a blinking dot on a GPS system.
Notably, most jobs are for “blue-collar jobs” (transport/delivery, manufacturing, electricity generation, farming, construction, etc.) with a limited selection of “pink collar jobs” (service industry job like cleaning, florist, food preparation, clerks/concierge, etc.). (Admittedly, some of these jobs might have the Pokémon work more as an assistant to humans or basically decoration/entertainment.)
It looks like the ability to read and speak is a big factor separating the kinds of jobs humans do from the jobs Pokemon do. Of course, there are still construction workers and miners in various games, but they might exist largely for supervising and directing the Pokémon, who do most of the actual labor.
According to Bulbapedia’s page “Poké Jobs”, the amount of money paid doesn’t increase depending the hours taken, so Pokémon labor is potentially much cheaper than human labor for jobs they’re suited for. I do wonder what the implications would be if Pokémon could read. With a fast enough pipeline for obtaining and training Psychic-type Pokémon, there would be few jobs left for humans. It would be a job security nightmare. The only jobs left would be ones that require speaking (sales, acting, teaching, daycares, etc.), medicine, research, and the direction/supervision of Pokémon or complicated plans (e.g., architecture).
It does put others' interest in Team Rocket's Meowth in a less flattering light...if people can replicate Meowth's technique for learning how to speak for other easily-obtained (non-legendary) Pokémon, it would lead to massive profits and mass layoffs.
EDIT: I just realized something. I believe that, in the movie Detective Pikachu, Ms. Norma, a disguised Ditto, texts someone. This suggests she can read. Admittedly, this is mixing canons, and she is apparently a genetically modified Ditto.
