Isn't it obvious? I see why no others have answered to this. Since it's probably the most stupid question ever. I am not going to answer it.. Because it's so stupid. Your rival picks your weakness because it makes the game harder. Beating your rival would be too easy if he/she didn't pick your weakness. -Usyflad10
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If you pick Turtwig, regardless of your character's gender, your rival will have Chimchar and Rowan's assistant will have Piplup. If you pick Chimchar, your rival will have Piplup and Rowan's assistant will have Turtwig. And etc. No changes are caused in the storyline, no matter what you do.
in a fight on your rival,hi with level 60,you got the number
Owen does not have a rival in ToT. But in AP Kathy is your rival for Owen.
You actually get to name your rival. So, your rival is whoever you want him to be. The rival is just a strange character that happens to be eying Professor Elm's Pokemon.
It is right behind the explosives on the left, in front of the house next to the last ramp with the money pick ups