>>35008296OP mention the two faces of the coin. Good designers usually design characters with a extended idea of them (how live, how their personality are...). For example Teruteru is a perverted lewd pig who his personality and role is adapted better on his official design than on the beta one.
In the case of Pokémon, they think the designs more than "it just fight", and normally thinks them in another cases as for example how could we see them in the nature (pic related: bottom right) or the gimmick that they could have to not be just a waste of space on the Pokédex. Obviously, this doesn't always mean that design will be beauty or rad (like we could see on the OP pic) and some people think that not being appealing at the first look is the opposite to "well-executed".