I've actually been doing video game work for quite a while now (over two decades), including projects for things like PCE, MD, and SFC. Apparently the Pokemon art director, Sugimori, had taken notice of some of my past work and that's why he asked me if I'd be interested in doing some design work for Pokemon XY.
So in some ways, designing Pokemon for XY was like an extension of my days of drawing monsters for "ActRaiser 2" and "Beyond Oasis". I am a Pokemon Trainer as well as an illustrator, so needless to say I was incredibly honored and pleased to have this opportunity.
I just thought the Pokemon XY players following me might find this information interesting!