Something I think you could do is c/p the text and paste it into microsoft word, then go in and pick out all the spelling/ dramatic grammar mistakes. While the spell checker is still bound to miss some stuff, if it even removes like a quarter of your mistakes, it'll make GPing significantly easier.
Thx a lot for your GP check man, and generally your patience when checking my analyses. I think that if it weren't for you, the other GP checkers wouldn't approve of my analyses and i would have to threaten them :D. I will try to get better, so that you could stop facepalming every time i ask for a GP check. I also found a way to remove all the grammar and syntax errors, by simply writing the whole analysis in word (i was writing it in the smogon text editor before). Again thx for your help!
EDIT: Also do you know how i turn on the spell checker on the smogon editor? It doesn't have the auto correction about grammar mistakes anymore and i can't find how to fix it...