Seriously? That's really dumb. I mean, just because there's no killing or swearing in it, it's a "child's game"? Trust me, it's not a child's game at all, imo. There's plenty of people in their 20's in college or with full-time jobs here on PC who play it (myself included, and I have no intention of stopping any time soon xD) Don't even worry. It's a great series regardless of how old you are. Btw, I play Minecraft too :D
I'm going to be choosing Treeko. Mega Sceptile is my favorite of the Gen 3 starters. I like Mega Blaziken too, but I already have the Blazikenite in Pokemon Y. How about you?