Where can one find Caterpie?

Caterpies could have been found in grassy or forest environments in most of the Pokémon video games, depending on the game. However, in earlier Pokémon games, one could have found Caterpie very early in the game, meaning that one could have caught and bred their first Bug-Type Pokémon. It is important to know about the evolution of Caterpie because Caterpie can evolve to become Metapod and later on Butterfree. Searches such as caterpie caterpie or catapres will be searches for this Pokémon