When Kakashi was in the Fourth's Squad when he was younger, he and his team mates, Rin and Obito Uchiha, went on a mission to destroy a bring that an enemy was using. Kakashi was assigned the leader, for he'd just become the leader of the group and everyone had to give him a gift, but Obito didn't. This is very much like a Sasuke and Naruto thing. But during the mission Rin get's kidnapped and Obito wants to save her, but Kakashi says no, and that they must complete the mission. Obito ignores him and goes to save Rin. Kakashi reflects on everyone's kindness and goes with Obito. Kakashi showed up in the nick of time to save Obito but was later cut on his left eye, taking his in his left eye and giving him the scar he has today. Obito gets scared and awakens his Sharingan and defeats the enemy. Kakashi and Obito go to save Rin and just as they're leaving an enemy does a cave in style justu. Obito pushed Kakashi out of the way as a boulder was falling and he ended up being crushed. Obito knows he's going to die so his gift in the end to Kakashi is his Sharingan (his right side had been crushed leaving his left slightly better). Rin is a medical nin, and removes the Sharingan and places it in Kakashi's left eye socket. Kakashi then uses the Chidori and Sharingan to kill the enemy nin, but Obito is already dead by the time Kakashi is done.
And thus Kakashi got his Sharingan.
mangekyou sharingan
yes
Sasuke Uchiha learned to use the three tomoe Sharingan in Part I of the Naruto series, and later unlocked the Mangekyou Sharingan after Itachi Uchiha's death. Through further development and training, Sasuke eventually awakened the Eternal Mangekyou Sharingan.
Sorry for being a Spelling Nazi but it is spelled Mangekyou Sharingan. Yes Uchiha Sasuke can use Mangekyou Sharingan. He gains it after defeating Itachi in Shippuden.
He gains Mangekyou Sharingan by killing his brother Itachi.
no sasuke can't
Itachi, that's if you're referring to how Sasuke achieved the Mangekyou Sharingan. When Madara reveals that Itachi was doing things for the better of Sasuke's life, Sasuke realizes that Itachi was the closest person to him which activates the Mangekyou Sharingan.
he got the mangekyou once he defeated itachi.
*I'll only answer about Sasuke's Mangekyou Sharingan Sasuke can perform an early stage of Susano'o, he can do the Ameterasu (the Eternal Black Flames), and Tsukiyomi (powerful Uchiha Genjutsu). Sasuke will get the Eternal Mangekyou in the manga, but how it will look like and what Sasuke will be able to do is unknown
When sasuke finally GETS his mangekyo sharingan, Itachi already removed the curse mark.
Is one like a star of 6 poits.
sauske will obtain mangeykyou sharingan when he kills his brother itachi.