User blog comment:Jho5689/Fairy Tail 337 and onwards/@comment-182.18.208.5-20130622125947/@comment-7418318-20130623080115

Oh, I forgot about that one year comment. That's actually a pretty good indication for Acnologia already being on the offensive at that moment in the other timeline, though it's still possible that it turned up even sooner and Rogue and Frosch were able to evade it for some time, before getting caught.