Question: how kakashi get his sharingan?
Answer: Kakashi got sharingan in both eyes during the 4th shinobi war. In the episode 473 you can see kid Rin meeting kid Obito and obito says her that kalashi is helpless and he is going to give him his sharingan for sometime. ... There he takes kakashi to some place where they become kids and obito gives him his sharingan.