Well, it could be that the storyline didn't resonate with the audience, or there might have been problems with the cast or budget. But I don't have the definite reason.
Yes, mangas can be considered graphic novels. They share many characteristics such as being a combination of text and illustrations to tell a story. Manga typically has its own unique art styles and narrative structures, but like graphic novels, it uses sequential art to convey a plot, develop characters, and create a fictional world.
Yes, there are. The Pokemon mangas present diverse plots and art styles, giving fans more ways to enjoy the Pokemon universe. You can find them in comic stores or online platforms.