While I don't have a Amoongus or Gothitelle to start breeding for the nature, you could check the Wi-Fi Trading forums to see if someone has one. Gothorita is also obtainable in the Friend Safari. I'd recommend looking through the safari thread to see if someone has a Pyschic Safari with it.
I'm also planning on going to Nationals. Three of the last four years I've been staff for it.
I'm also planning on going to Nationals. Three of the last four years I've been staff for it.