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Truthfully, you can use anything to beat the game. I beat HG with teams of three (first time was feraligatr, ampharos, and espeon, second time was typhlosion, victreebel, and espeon). If you really want to use a team of six, I'd recommend (in addition to totodile):
Ampharos
Espeon or Umbreon
Jumpluff or Victreebel
Scyther/Scizor or Heracross
Pidgeot, Noctowl, or Crobat