in platinum you have to beat the elite 4 and have the national pokedex. after go to the island in the top right corner. to get there you must get too snowpoint city and take the ship. im pretty sure its the same in diamond and pearl
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Its the battle tower brain Palmer
You battle Barry's father after you have completed 21 battles successfully in the Battle Tower. This may take several attempts to complete.
you can battle them on routes 224 and 230 in platinum
U need skill, LOTS, it's hard and at the end u meet your rival's dad!
No you can not battle dawn in platinum:( but you do work with her several times against team galatic