From Bulbapedia, the community-driven Pokémon encyclopedia.
Iwashita's final illustration
Asuka Iwashita (Japanese: 岩下明日香) is a conceptual character artist for the Pokémon anime, specifically the sixth, seventh, and twelfth Pokémon movies. In addition to these three movies, she worked on the special episode, The Mastermind of Mirage Pokémon.
In addition to working on the Pokémon anime, Iwashita worked as a graphic designer for many of the Pokémon games. Working from 1999 to 2005, she is credited for many of the games, from Pokémon Gold and Silver all the way to Pokémon XD: Gale of Darkness. In addition to being a designer for the games' graphics, she is also credited for designing Pokémon in Generation III and beyond.
As an illustrator for the Pokémon Trading Card Game, Asuka Iwashita illustrated 5 cards, beginning in 2001. Her first illustrations were featured in Pokémon VS, in which she illustrated all of Sabrina's featured Pokémon. In 2004, three years after illustrating these cards, she was credited as an illustrator for the last time on Makuhita. For a list of cards she illustrated, go here.