List of in-game event Pokémon in Generation I

This is a list of Pokémon obtainable from events found in the Generation I Pokémon games. These specific instances of Pokémon can only be obtained once per game; however, some may also be obtained in other ways as well.

Magikarp
A salesman in 's Pokémon Center will offer a to the player for 500.

Snorlax
There are two set encounters with Snorlax accessible via the Poké Flute; one on and one on. The player must capture or defeat at least one of them to proceed to Fuchsia City.

Hitmonlee and Hitmonchan
Kiyo, the master of the Fighting Dojo in Saffron City, will reward the undefined with their choice of either or  after defeating him.

Lapras
After defeating during Team Rocket's invasion of Silph Co., an onlooking Silph employee will entrust the player with a.

Omanyte and Kabuto
The Helix and Dome Fossils are found at the end of Mt. Moon, but the player may only choose one to keep. The player may revive the Fossil in the Pokémon Lab on Cinnabar Island.

Aerodactyl
The Old Amber is located in the secret part of the Pewter Museum of Science, which can only be accessed with. The player may revive the Fossil in the Pokémon Lab on Cinnabar Island.

Articuno
is found within the depths of the Seafoam Islands.

Zapdos
is found inside the abandoned Power Plant.

Moltres
can be found in.

Mewtwo
is found within the depths of Cerulean Cave, accessible only to powerful s who have defeated the Elite Four.

Starter Pokémon
Professor Oak gives the undefined a choice of, , or as starter Pokémon.

Eevee
A Poké Ball containing can be found on the roof floor of Celadon Mansion in Celadon City.

Pikachu
Pikachu will be caught and given to the undefined by Professor Oak.

Eevee
A Poké Ball containing can be found on the roof floor of Celadon Mansion in Celadon City.

Bulbasaur
will be given to the player by a girl in Cerulean City if the player's starter has high enough friendship.

Charmander
A boy north of will give the player a.

Squirtle
An Officer Jenny in Vermilion City will give the player a after defeating Lt. Surge.