Board Thread:Versus Debates/@comment-9782468-20150219204421/@comment-3965545-20150429002936

Madara teaches Obito about the Rinnegan and it's abilities, he teaches him everything. Then Obito says to Nagato while acting as Madara he could teach Nagato about his Rinnegan and bring out its full abilities. Chapter 606 and the anime that shows that chapter

https://scontent-ord.xx.fbcdn.net/hphotos-xpf1/v/t35.0-12/11182987_10205129782657076_1457403740_o.jpg?oh=407e7c543319bd7b8a7372fe917165c1&oe=55428528

Obito teaches all of this to Nagato after Yahiko dies.