In Diamond, my player name: Pichu
In Platinum, my player name: Pichu
In HeartGold, my player name: Pichu
In SoulSilver, my player name: Roy (ロイ)
Named my Chimchar in Diamond "Phlegon"; in Platinum, I named my Chimchar "Anji"; In HG, named my Cyndaquil "Riela"; in SS, named my Totodile "Wacan", after the berry.
The Rivals, kept them as their normal names. [/too lazy] XD I only remember my SS team's names at the moment:
Feraligatr: Wacan, Leafeon: Midori, Crobat: Chrome, Weavile: Hina, Ambipom: Nozomi, Pikachu: Denki (after "electric" in Japanese) and Froslass: Yukika. I know that's seven Pokemon; I alternate between Hina and Yukika. Been EV training them as best as possible. :P