From Bulbapedia, the community-driven Pokémon encyclopedia.
Atsuko Nishida (Japanese: 西田敦子) is a graphic artist who has been involved with several aspects of the Pokémon franchise since it began. She was part of the graphics team on Pulseman, one of Game Freak's most successful early titles, working alongside Pokémon creator Satoshi Tajiri and artist Ken Sugimori. During the development of the first Pokémon games, she helped design key characters and several Pokémon, also contributing to the conceptual design of characters that appeared in the first few Pokémon movies. Nishida has continued to work within many areas of the franchise, credited on the majority of the main series games, movies, and produced an array of original illustrations for the Pokémon Trading Card Game.
Work for the TCG
Nishida has produced illustrations for the TCG since the some of the earliest Japanese promotional cards, though her first in regular expansions was in the Team Rocket set. Nishida's style is distinctive, using an airbrush technique with a soft palette of colors that is easy on the eyes and convey the feeling that the portrayed Pokémon is at one with their environment. Light is also a large factor, using it to highlight key areas of the overall image to maintain the "soft" aspect. For a list of cards she has illustrated, go here.