put is this way.. most banette decks are all built the same with a couple variable suprize factors.. now if you know the basic build of the banette deck.. it wont necessarily give you the W.. but it'll almost give you a 55(GG+tech) to 45(banette) chance of beating banette if ur GG+tech.. if you dont have a tech.. it almost works it's way in reverse to 45 to 55 even if you know the banette deck inside out... so just learn how a banette deck works and learn how to play around it..
i'm not gonna lie.. GG's hardest matchup is banette.. you have to play a flawless game if you want to win.. because banette has the advantage on you, they are allow to make a couple mistakes.. but you can't.. just keep that in mind..
so remember, against a banette deck, there's no such thing as a blowout win.. it'll come close, but if you play a flawless game in predicting the banette player's move and correctly countering it, utilizing all the tools you have, the percentage of you coming out with a W is higher.. there's is no auto win or auto loss.. it's up to the player to decide.