It was in the manual and the Player's Guide. You can find ditto on page 47 of the latter. https://www.scribd.com/document/586237858/Pokemon-Red-Version-Manual

It was in the manual and the Player's Guide. You can find ditto on page 47 of the latter. https://www.scribd.com/document/586237858/Pokemon-Red-Version-Manual https://www.scribd.com/document/586237858/Pokemon-Red-Versio... https://archive.org/details/NintendoPower1998PokemonRedBlue/mode/1up https://archive.org/details/NintendoPower1998PokemonRedBlue/...