Is this translation valid? Is the source reliable? If so I take the bit about design style to mean just that; the design of the Pokemon draw inspiration from a generalization of each region's art style, obviously fitted to mesh with the Pokemon world.
Smugleaf's large bulbous eyes could be viewed as a classic cartoon staple. The shape of its head, especially, is demonstrative of modern
Western animation. Strong attention paid to silhouette, you get something of a flat, graphic shape that makes a powerful statement viewed from a specific angle, but does not lend itself well to be being turned around in three dimensions.
Otter is kind of a parody of Japanese chibi motifs...Hello Kitty and all....at least I find it funny.
Fire Pig isn't the easiest to argue as obviously Chinese.
Chinese animation before it started getting homogenized to look more Western or Japanese looked a lot like their classical brush paintings come alive. In that sense, the designs could be said be intricate, with emphasis on curves and swirls. Very rounded lines, but not consisting of even shapes like circles.
Anyway, all that to say, if we were to take stock in that interview, I don't think it'd mean the Pokemon were designed taking into account Western or Chinese themes...they already create Pokemon drawn from cultures all over the world. It also wouldn't point to Grass/Dragon as dragons are staples of legends from many cultures anyway.
Also, I'm pulling for Grass/Psychic...EVEN if it means we get another Fire/Fighting!