Naruto: It’s Only Natural That I, Itachi, Know the Eight Gates

Hokage + choices + battles + a brother complex

Is it really so strange for a genius of the Uchiha Clan to know the Eight Gates? What, you say the Eight Gates aren't strong enough? I'll hit you right in the crotch with the Eighty Gods Vacuum Attack! Still not strong enough?

Ever heard of the strongest jutsu in Hokage?

“Thousand Years of Death!”