I discovered the games on GameBoyColor before, then I watch the anime and movies. But the manga, Pokémon Special, is definetely the best! *__* Good inspiration from the original games, I'm waiting forever to a good anime adaptation...
Gintama, so hilarious and interesting! But only if you don't mind watching or read a long series without main plot. And you need to know a little bit about Japan stuffs to really enjoy the parodies.