Pokémon Red Version, Blue Version, and Yellow Version - Evolution

Tags: pokemon-red-blue-and-yellow, in-depth-guides, evolution

Some Pokémon can evolve:

1. At the end of any battle (except battles the player lost) in which the Pokémon levels up or after a Rare Candy is used on it and takes effect;
2. When a certain item is used on it; or
3. When the Pokémon is traded to another game.

Those are the three basic ways that Pokémon can evolve. Here is a more detailed list.

• Case 1 (The Pokémon levels up). The evolution can be canceled by pressing B while the Pokémon evolves.
  • The Pokémon is at or above a certain level (most Pokémon).
• Case 2 (The Pokémon is traded). An example is Machoke. The evolution can’t be canceled.
• Case 3 (A certain item is used on the Pokémon). An example is Pikachu. The evolution can’t be canceled.

Special notes:

• Day-Care: A Pokémon placed in the Day-Care won’t evolve, even if it gains enough Exp. Points for its level to go up.
• Name Change: If a Pokémon whose nickname is the same as its old species’s name in a game in a certain language evolves in that game, or is traded to another game and evolves in that game, then the Pokémon’s name changes to the name of the new species in the language of the game where the Pokémon evolves. (Pokémon names are in upper-case letters, so upper-case letters are distinct from lower-case letters. Mr. Mime is called MR.MIME -- with no space.) No other case can make a Pokémon’s name change upon evolution.