>>54868772No. It is at least well known that Game Freak did a big overhaul to the Pokémon engine for Gen 3.
During one of the interviews that mentioned how much effort they put on that, Ken Sugimori remarked that even the visual aspects took a backseat during development, including pokémon sprites. This is why Brendan looks like a snowboarder, as his design was for a snowy region but didn't get revised until Emerald, and why overworld sprites differ so much from battle scene sprites. Heck, even the official artwork has mistakes (note how Mightyena has a black nose).
