User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-25083735-20150421003134/@comment-3298463-20150423112732

If you don't have high rank Expeditions unlocked yet then I don't think that Deviljho you fought was Apex, since you need to either finish all Caravan quests to fight one in the Master's Test (and you can't complete Caravan until you reach G3, and by then you'd have High Rank Everwood already) or level up a Guild Quest (which you can only get in High or G Rank expeditions).

Was it the Caravan one? That one is just Frenzied, Apex Jho has a lot more tricks up its sleeve.