Your rival in Pokemon platinum is a spiky haired blonde boy originally called Pearl for the game but called Barry in the US/English anime and Jun in the Japanese anime.
Pearl is simply your rival in Pokemon Platinum.
only with hacking
No it can not. I have tried this numerous times and nothing. It gives you no option for your rival to be female thus you can not get a female as a rival.
He is your rival's dad also the Battle Tower Tycoon.
you fight your rival
By beating the Pokemon league 20 times.
The rival the third time you battle him in survival area
You have to beat Lucas (Rival #2) At some point.
none code does not exist
No, you don't battle Ash in Platinum unless you named your rival ash. Other than that, it is impossible.
The rival's starter gets up to level 85
u catch evry Pokemon and your rival will give u a pass to the battle foniteir.