From Bulbapedia, the community-driven Pokémon encyclopedia.
region's Pokédex (Generation I)
This is a list of Pokémon in the order dictated by the Kanto regional Pokédex, meaning that the starter Pokémon from Kanto will appear first, followed by Pokémon native to the Kanto region.
This Pokédex, which was introduced in Generation I, is the first regional Pokédex. The numbering in this Pokédex would serve as the basis for the official listing of all Pokémon introduced, with subsequent generations' Pokémon being added on to the end, with the name of "Old Pokédex" in Generation II and then the "National Pokédex" ever since, starting with Generation III. For more info on this expanded number listing see this list.
List of Pokémon by Kanto Pokédex number
#001 - #051 Bulbasaur - Dugtrio
#052 - #101 Meowth - Electrode
#102 - #151 Exeggcute - Mew
- This is the only regional Pokédex listing from the four original regions that contains only Pokémon from one generation. The only other regional listing that contains only Pokémon of one generation is the original listing of the Unova Dex, native to a region not part of the same nation as the other four. However, being the first generation, this is expected.