1998, Mama, Papa and Granpa Gengar with their little Haunter by Aya Kusube 楠部文, illustrations from ちいさなゴースト (The little ghost) in the series Pokémon Tales (ポケモンえほん Pokémon Picture Book)
Here's some of the expression sheets for Pomni, Jax, Ragatha, and Gangle. I didn't end up making any for Kinger, Zooble, and Caine, because their rigs were way simpler, and didn't need specific guides like this.