hey dave, I really don't wanna say this, because you've done so much for me, but the thundurus you gave me, was sassy nature :s and to be honest, i'm really nothing with a sassy thundurus. I saw on your trade thread that it was timid, so maybe you saw it wrong. i'm feeling really bad saying this, but can it be traded back for a timid one :s? if not that's fine by me though :) thx for understanding.
dave for better natures when you breed you should try to use an ever stone.
Here are some tips for getting good pkms if you don't know how to RNG breed. ;)
First hack a flawless parent with desired nature (and with possible egg move combinations) and make it hold the everstone. Hack the mother (or ditto Lol) flawless and hack it like it came from another country (so you can have higher chances of shininess).
Fast egg hatch code will help you if you have an AR (since I don't have one I suffer when hatching eggs Lol).
Well that's all I can say. :p
Also did you get my pkms? and don't forget, don't GIVE Vish anything!!! Muahahaha! x3