Pokemon Black and White: Walkthrough - Cheren Rematch
After you defeat the Elite Four for the first time, Cheren can be found on Route 5 where you first met Alder. After talking to him, he will be waiting at the top of Victory Road. Fly to the Pokemon League and walk south to Victory Road. He is inside the doorway to the right. Talk to Cheren. Marshal will eventually show up to impart some knowledge on behalf of Alder. Marshal leaves and Cheren is ready to battle.
 Cheren |
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You can battle Cheren here once a day from now on.