Hey Mike, welcome to the forums! If you're interested in competitive battling, you should consider joining the
Pokecommunity Battle Server to battle and chat with other members here. There's a lot of people there who play OU, UU, Ubers and so on. I'm sure someone will be happy to test your team with you once you build one. It's up to you whether or not you'd like to join though. What got you back into competitive battling, out of curiosity?
As for a pokemon with pokerus, I'm sure someone would have one to spare in the Trade Corner! You could try asking in the Quick Trade thread and seeing if someone has one. Good luck finding what you need! If you need any further help then please don't hesitate to contact a staff member. See you around. :]