Creator Profile: The Creators of Pikachu, su NA website of Pokémon, The Pokémon Company International (archiviato dall'url originale il 5 giugno 2022).
«Sugimori: “Bulbasaur, Charmander, and Squirtle were all designed by Ms. Nishida.”; Nishida: “I created the designs for Bulbasaur, Charmander, and Squirtle by working backward from their final forms. I wanted people to be surprised when it evolved into Charizard, so I designed the original Charmander in such a way that Charizard would be unimaginable.”»
