Evolving two Rhydon was a pain! Not many Kanto Pokémon left now to get on this LeafGreen save file: both Mr. Mime and Magmar; Male Pinsir and Lapras; Female Eevee, Vaporeon, Jolteon, Flareon, Omanyte, Omastar, and Aerodactyl; Male Dratini; and both Dragonair and Dragonite.

Edit: Bulbasaur line to get female too.