Hello Jacob welcome to PC! Glad to see you here :D. I think we've met on the server x), if my memory hasn't been tampered with. I'm Rainbow <3, it's awesome of you to come to PC :3! Like Mid has mentioned, I think the Battle Center would definitely be a good section for you. Their are tournaments to participate in, get team ratings and advice, discussions, events and more! It's a bustling section filled with eager battlers like yourself :).
I haven't played RU myself :/, but that's probably because I never even bothered to make a team D:. NU I do have a team, but it's horrible xD. Oh well, it's still fun battling on the server and in-game right :3? Other than that, we do have a variety of other sections you might be interested in.
For Pokemon, there's always discussions about various generations, the anime, all sorts of manga, trading cards and more! You can publish Pokemon or non-related hacks, do some artworks, open up trading or art shops, write fanfictions <3. Whew, there's a handful of things you can do here :D. Anything that particularly interests you so far :)?
You can call me Rainbow if you'd like <3. Feel free to chat anytime and I'll see you around PC and on the Showdown Server alright? Have fun at PC dude :D!