Question

I want to fight him again
But I don't know how to fight cheren Again

Answer 1

Yes. Fly to the Pokemon League. Go south to enter Victory Road. On your right, there is a cave. He will be inside. You can battle him once per day.

Answer 2

Yes, he will be able to battle you.

1. Fly to the Pokemon League.
2. Exit it through the ''Hallway'' at the South.
3. At your Right, enter the Cave and you will see Cheren, who can battle you once a day!

Hope this Helps!