AcacianLeaves said:
If you can look at the designs for the pokemon and not understand why its considered childish, there is no hope for you.
Is not something aimed at adults. Yeah the gameplay is deep, but it's wrapped in a presentation meant for children. It's childish because its meant for children. Adults can enjoy it too, but that doesn't change the nature of the product.
It wasn't initially aimed specifically at just kids. When the first games came out, BEFORE the anime, it was just an RPG in which you collected multicolored and super powered monsters. Given, the story or characters weren't deep, but it was the intricate gameplay and the desire to "catch 'em all" that made the game a success and launched more games, an anime, a card game, movies, etc.
Since then, these other branches of the initial concept, mostly the anime, have become more mainstream, as many people were introduced to Pokemon through the show, not the games. Because of the success and popularity of the show, the image and idea of Pokemon in general, including the Pokemon designs themselves, became more childish to appeal more to the growing audience of young children. The gameplay, however, is still the same: deep and complex.
If you CAN'T look past the designs for the Pokemon and understand why it's such a fun game, I'd say there's no hope for you.