Is Nergigante a difficulty spike?

Up to now I thought I was doing ok. I didn't use the defender armor this time around. I had on the pink rathian set and had the bone charge blade.

I got to the point that I know most of his attacks so I can play decently ok but his dive bomb was a one shot. It wouldn't be so bad if he roared before every dive bomb but he doesn't. I had to put on defender armor specially so that I don't kart in one dive bomb. Without the dive bomb I would've been able to down him.

Not to mention he has some pretty egregious hit boxes compared to the previous monsters. Do the rest of the monsters after nergy also have one shot attacks with no indicator that that's what their doing?

Any advice combat related?