Welcome to the forum!
Isn't Pokemon Y fun? X and Y are definitely my second favorite games in the Pokemon franchise. My all time favorite games are Heartgold and Soulsilver though, since Johto is my favorite region! All the games are a ton of fun though. Be sure to check out the section dedicated to X and Y, where you can chat about the games, post your progress, and ask for advice. We have sections for all the games like that too, from Red/Blue to X/Y! Be sure to check them out! They're quite popular.
And as the others have said, check out the Battle Center. You'll find a ton of challengers there. You won't be disappointed! Enjoy! :3