Wow, legit hacks my foot... normally I allow this kind of thing, but here's the problem:
Standard 6/0 Yanmega is supposed to take 65.81%-77.64% from 266 SpA Discharge. You took less than a third, causing me to believe you have 252 EVs in every stat.
252 HP / 252 SpD Yanmega takes 38.56%-45.48%, verifying that you indeed had maximum special defense. This could be a possible, weird gimmick set, right?
But then, here is how much damage your Yanmega would do to my Porygon2: 31.52%-37.23%
This means you had 252 HP, 252 SpD, 252 SpA. Sorry bub, those are unfair pokemon. I am not going to blacklist you, but you've got to get those fixed or else you will be blacklisted in the future.