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he is the first shinobi to get it,he then gave it to nagato for some unknown purposes; maybe it was part of his scheming of world domination. the way he got it was pretty simple in theory: as it is said in the story the sharingan,the mangekyou sharingan and then the rinnegan are the strongest and the most noble of doujutsu. so after getting his eternal mangekyou sharingan he was able to unlock this rinnengan thus becoming as powerful as the rikudu sennin.
What else can I help you with?
Where does Tobi get the rinnegan?
After Konan died Madara (Tobi) found Nagato's body and he transplanted Nagato's rinnegan into his left eye.
Who has rinnegan?
Pein possesses the rinnegan and the founder of the ninja world also possessed the rinnegan. No one..at the moment right now in the manga..506..there is no living person with it..only two ppl known to have had it..nagato (pain) and rikudo sennin (sage of six paths) [and founder of ninja world]....both DEAD...the way the manga is leading btw...naruto might possibly have rinnegan eyes waiting to be unlocked.. After Madara kills Konan, he takes the Rinnegan from nagato and does something with it. It is unknown what he is going to do with it, but it can't be good. I am sure that Nagato is not the last we see of the rinnegan.
Does obito have one sharingan?
He has two. He has managed to replace his missing one, since he can awaken the Rinnegan in it, it's reasonable to say that Madara gave it to him before his death - the resurrection jutsu Nagato was preparing did not require Madara's body to have the original eyes, nor did the Edo Tensei.
Is the rinnegan real?
In the manga yes, the Sage of Six Paths was the first to wield it then Madara Uchiha then Nagato and then Tobi who stole one of Nagato's eyes. In real life however no it is not real.
How did nagato get the rinnegan?
He gathered a bunch of corpses, placed chakra receivers in them and channelled the six paths techniques through them
