If you play as ether a boy/girl the text that your rival says is altered.
Kimm57: Go to Slateport City, then go southwest of the Pokemon contest
Yes
you can not change your own name without starting over
If you're asking how to move your Pokemon from Ruby to Platinum, then all you need is a DS (NOT a DSi) and a bit of time.Make sure that Ruby is in your Gameboy Advance slot on the DS and Platinum is...
There is a man in Slateport that will change your pokemon's name.