#530 - Drawing for Change

According to Junichi Masuda, when making Pokémon Let's Go, he thought about Psyduck having its own version, but decided against it because it's the same colour as Pikachu. In the end, Eevee was picked after seeing it had a very high amount of fanart.

SOURCE: https://www.theverge.com/2018/5/30/17384582/pokemon-lets-go-eevee-pikachu-fan-art-nintendo-switch