You know, see if he shows up before most of the battle results are released. I'll give you an auto win anyways if we're nearing the end of this final round and he doesn't seem to have shown up (if he does, VM me! ).
Regarding Greninja, you're definitely right there. Generally I'd like to say I outpredict people and using Greninja works against most challengers. In your case, like you said, it went spot on and eliminated a threat that could have wiped out over half your team. I underestimated your predicting skills given you had not used it the first turn. ^_^