I named my characters all the defaults except in D/P/Pt and HG/SS:
Diamond
PC: Kauko
Rival: Kustaa
Pearl
PC: Berezi
Rival: Inaki
Platinum
PC: Inaki (I had intended that to be the rival's backstory of some kind)
Rival: (I don't remember)
Heart Gold
PC: Oihana
Rival: Silver (too lazy to name.)
Soul Silver
PC: Andoni
Rival: Silver (too lazy to name.)