These are the Pokémon that you only have one (or two in Snorlax's case) chance to catch them.

Articuno, Moltres, Zapdos, Mewtwo, Snorlax

These are the Pokémon that are unique to each respective color. *A Pokémon followed by --- and another name means the second name is the first one's evolution..

ex: Meowth---Persian (Meowth evolves into Persian)

Blue:

Bellsprout---Victreebell

Magmar

Vulpix---Ninetales

Meowth---Persian

Pinsir

Sandshrew---Sandslash

Red:

Ekans---Arbok

Growlithe---Arcanine

Electabuzz

Oddish---Gloom

Mankey---Primeape

Scyther