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What's the best true (no HM slaves of other types) monotype Nuzlocke in the first few games?
>Red/Blue, Water
Great on paper, but you're stuck with Squirtle for a long time, and I think that you can't get a Pokémon that learns Cut early enough?
>Red/Blue, Poison
Wide variety, several options early on, Bulbasaur is good in the early game, Nidoran can carry you.
>Red/Blue, Flying
If you're willing to count Charmander as a Flying-type before it evolves into Charizard, this is probably the easiest one.
>Gold/Silver, Water
The only doable one in this generation.
>Ruby/Sapphire, Water
Excellent variety, decent possible core before the first gym.
>Ruby/Sapphire, Grass
Doable, but difficult. Some gym leaders will give you a hard time.
>Ruby/Sapphire, Ground
Similar to Flying in Red/Blue in that you will have to accept Mudkip as a Ground-type until it evolves.