Itatchi never gives naruto powers, but he does give sasuke powers. he gives sasuke the Amaterasu, and susanoo.
spoilers
- itachi gives sasuke the powers right before he dies while fighting sasuke in episode 138
-Amaterasu- when sasuke looks at someone, he can make black flames appear and attack them, water can't put it out, only a sharingan can do that. it makes sasuke's eyes bleed a lot when he does it though
-Susanoo- summoning technique, where sasuke can summon a giant warrior, but only in peices (he can only summon one piece at a time, like the shield, or sword, arms, etc), susanoo carries a legendary sword, but only itachi has managed to get it, because he has mastered it, and can summon the whole thing.
(True Answer) : Itachi gave naruto a power to stop sasuke from his huge hatred.
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Itachi did not give his powers to Naruto. Instead, he gave a crow with a Sharingan implanted in one of its eyes to Naruto. That Sharingan was Shisui's Sharingan which had the ability to brainwash anybody if used in the Mangekyo state.
It is unknown which powers Itachi gave Naruto. It might be revealed soon as the long-awaited battle Naruto vs Sasuke is about to begin. what itachi gives naruto is uchiha shisui 's eye. shishui 's eye is very powerfull and it can control a person without him knowing he is being controlled. he was a gifted uchiha.danzo has his right eye and naruto his left. itachi puts acrow inside naruto,that crow has the sharingan of shisui. that crow will come out if someone activate amaterasu or tskuyomi which itachi feels will save naruto from sasuke's sharingan 's power. That power is called koto amatsukami.
He handed it out before he died
It was more chakra for him to use in the future.
It's not sure exactly what power Itachi gave Naruto. All that is known is that Itachi gave Naruto some of his power. You can go to episode 126 and also watch it but in that episode they cut the part where Itachi gives Naruto some of his power. You may have to check the Manga.