Don't worry about the gurrderr, cause I trade-evolved it yesterday while trading with someone else. I will help you evolve your karrablast and shelmet. While I'm not willing to trade Thunderus, we can help each other get landorus. you don't need to keep Tornadus or Thunderus to get him, but you do need both in your party in order to catch him. So we would have to take turns trading each other and the end trade back so we can both get Landorus.
I'm ready right now if you wish to trade :D