The Lightning Rasengan is the Rasengan taught to Kakashi Hatake by Minato Namikaze. Minato taught him the Rasengan and he used his lightning type to create the Lightning Rasengan. Kakashi's elders know how to use this and he learned this jutsu in the year of 2008. The Lightning Rasengan and Fire Rasengan are equal to each other. This jutsu can be used in any fanfiction on his website.