Why does cheran stay at the Pokemon league in the cave, does he stay there 4 you to battle?

Question

cheran

Answer 1

Yes.after you meet him on route 1 and meet him on the route five he will then be on victory road after that marshal appears and talks to you after that cheren challenges you to a battle then if you wait until the next day or beat the elite 4 you can battle him again

Answer 2

Cheren
Yes Cheren is there for you to rematch every day.
His team is decent and you can view it on that link.