What do the people in the world of Pokémon actually read, you think? My guess is that they'd read the same things we do, only their versions of classic books have Pokémon in them.
The reason I'm giving this any thought at all is because yesterday, Nintendo tweeted out stuff with the hashtag #pokemonbooktitles:
Naturally, people started following suit with their own ideas -- and some of these books even came with lovely Photoshops of potential covers:
Pretty good, huh?