What's the name of the opponents Ash fought against in Indigo Pokémon League?

I didn't watch the Anime and I just couldn't figure out the names of those Ash's opponents in Indigo Pokemon League(The battles in Kanto area). I remembered it should be four participants that Ash defeated before losing to a boy named Richie. So anyone of you know the name of those four opponents of Ash? I'd appreciate it very much if you could help since it's significant for the game project I'm currently working with...

According to Bulbapedia:

Water Field: Mandi
Ice Field: Pete
Grass Field: Jeanette

The one on the rock field is unnamed.