What kind of power do you think Itachi gave Naruto

He gave him a power that allows him to decrease the flow of time to defeat sasuke and give sasuke a worthy challenger because to itachi, sasuke is boring

I think its the power to stop sasuke.. itachi already knew what will happen, he was amazed that naruto loved his brother so much and he thinks that he’s the only one capable of stoping he’s younger brother so he decided to trust naruto and gave him power.. I think its a counter for sasuke’s power or I think its against the susanoo.. because I think the amaterasu stuff is already examined by jiraiya, if you remember when jiraiya trapped itachi inside the frog, itachi used amaterasu to escape, then jiraiya examined the amaterasu.. dont worry because I think, naruto will really win this.. hehehe still just prediction haha