OK I'll try doing the Yanma...
BTW, sending me a .sav doesn't mean you can't play your own cart anymore (unless you reset it)...
I think you already know that, right? :p
Anyway, I think RNGing Thundurus isn't harder, it's just that finding shiny Timid 31/HP_E/30/31/31/31 seeds takes some time :P
And hopefully the RNG dates of those doesn't fall on rainy days...