>>34539116He started out in Genius Sorority, the company that was in charge of the Gamecube games. At some point along the line GameFreak absorbed part of GS' staff. It's probably just coincidence that he did Shadow Lugia and went on to create more but you'd have to ask him to know.
>>34539135There's at least one confirmed case of a Pokemon's type being changed without the artist's permission (Frillish line), the designer was pretty pissed about it.