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when you are about to battle the elite 4 you walk in the door and you see your rival. Then he/she challenges you.
no he is not. the champion is Cynthia not your rival
Your rival challenges you at the Pokemon league Mondays and Wednesdays.
No, your rival doesn't become Champion.
lance
You don't need to defeat the Elite 4 20 times, your rival is at the Fight Area every Saturday.
resort area
at the battle area after the elite 4
Bruno Gary (Rival)Lorelei Agatha
no
at the elite 4 before you fight them. in the afternoon.
You need to get the Pokemon that are super effective against the Elite Four and Gary, (your rival) the champion