Season 4: Episode 158: Fate of the Pharaoh Part 3
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the pharoh finds out his real name (atem) and gains his power back. but he has to have a final duel so he can return home (if he loses, he stays). he plays against yugi and loses, but being able to accept and learn from defeat was his final test and he goes home.
The fourth episode of the second ova, I believe.
You just find him randomlly sometime's it will be Yugi moto sometime's Yami yugi
YUGI!
No one's sure of that yet. The ending just shows Jaden showing a pose, and straight after in the desert (after the battle). Most people think Yugi won because of what Jaden said later.