>>32795288Elaborate on "concept art shown in Bulbapedia". If you're referring to these character sheets in pic related, they're not concept art. They're character sheets the 3d modelers use. These could literally be early concept doodles scribbled on the back of a napkin that Gamefreak staff made. The concept stage of development is very loose compared to the later stages of monster design, in my experience at least.
fyi,
>>32794940>>32794935>>32794886>>32793514are legitimate concept art showcased by gamefreak, and look nothing like what we've seen. You know nothing of the inner workings of gamefreaks development cycles.