Hey there Josh, welcome to PC! Or Joh.. whatever you prefer. ^^
Yep, it is indeed allowed to have friend codes in your signature! That's really the only place you can have them in actually, haha. We don't have a thread right now for listing your friend codes so a signature is the best option. Are you a trader or battler, by any chance? What do you like to usually do in your Pokemon games? I've recently become a breeder and EV trainer, which has been loads of fun, though I can't utilize that to its fullest potential since I don't have Wi-Fi. :(
Aaand Google is great! Google Voice in particular has saved me so much money since I don't have to purchase monthly texting plans. And of course we all know that Google is by far the best search engine out there! Other than being a Poke and Google fan, is there anything else you like to do? Maybe watching TV, playing a certain other game, reading, music and so on? There's a lot to do on a forum of this size so I'm sure you'll find lots of boards to keep you busy! Just make sure not to disappear on us. :D We'll all be sad if that were to happen.
Enjoy your stay on PC and good meeting you! ♥