Ah! Excellent suggestion! Yes, books can sometimes be excellent devices for enrichment, as are art supplies, music, and so forth. Of course, it’s also important to be aware of your pokémon’s preferences as well. Some pokémon simply don’t enjoy reading or being read to and should be given other materials. You’ll be able to tell whether or not your pokémon is engaged with the material you’ve given them by their body language and whether or not they’re focused on you (as opposed to quite literally anything else in the room).