Ummm, I think some of that got lost in the translation ....
First of all, why would that be a problem for singles, doubles or whatever? We all know that some attacks don't have 100% accuracy, and there are attacks which boost evasiveness - even some abilities which stop loss of accuracy like Keen Eye. I read somewhere that it's possible to raise it, but no details were given. So am I to assume that it isn't a legitimate (or legal) thing to do with the game? And whose rules are you talking about? If it's best to pm me about that, ... please by all means do so. I'm all ears.
And if that's the case .... what's predicting critical hits got to do with the price of tea in China? Kinda out in left field, you lost me for sure with that one.