You have to receive their number in the Pokegear and call the at specific times
You'd have to use cheats.
I'm sorry, my last answer was wrong, you can rematch them, but you first have to get their number, and some of them will only rematch you on certain days.
Wednesday from 10 to 19:59
on any day go to diglet cave
You can call certain ones depending on what day it is.
yes but for more information go serebii.net and look to the left and find gym leader rematch
yup you can
You go up to her click b,b, a, and then splooge in her face :) helpful
With your pokemon... noob
get their numbers
Rebattle the elite4.
you battle trainers again by adding them onto your pokegear and then soon they will want a rematch