Pokémon mangas are great and way better than the anime. The maturity level is usually at least as high as for the main games. I recommend you try many different Pokémon mangas.
I did a decent post
here (in my opinion), that explains what English Pokémon mangas are available.
There are some errors in the post though:
1. Pokémon Mystery Dungeon: Ginji's Rescue Team is VIZ exclusive. (Actually the only VIZ exclusive Pokémon manga, Chuang Yi has published all other Pokémon mangas that VIZ has published and more).
2. Currently 43 volumes of Pokémon Adventures have been published in Japan (42when I made that old post) and 40 volumes have been published in Singapore. It looks like the writer of that post has confused VIZ's mini-volumes with the full volumes and more volumes have been published since that post.
3. All That Pikachu! Ani-manga isn't a manga, just a compilation of screenshots from the first two Pikachu shorts with speech bubbles edited in = bs.
4. VIZ has since then announced that they will publish a lot more Pokémon Adventures volumes. You can read more about that
here.