In Naruto Shippuden episode 473, ...
Kakashi uses Obito's eyes to create Susanoo. But Obito's eyes were not Eternal Mangekyou. Previously, he had Rinnegan which he has borrowed in addition to one of his own eyes, and that's why he could do lots of stuff.
When did Obito awaken the Eternal Mangekyou Sharingan?
Note: this is not the same question as When did Kakashi and Obito awaken their Mangekyou Sharingan?. Eternal Mangekyou is when someone from Uchiha gives his Mangekyou to someone dear then it becomes eternal and the powers will be activated.