
Slither Wing is presumed to be ancient ancestor of Volcarona, and therefore, as an evolutionary predecessor, lacks the ability to fly, but still has fully formed, non-functional, wings. This is a way of saying I've take a bit of creative liberty and re-added the wings that the original Pokemon has, but that the sprite, at least from the front view, lacks. As there's no back sprite left, there may be some wings hiding back there yet.
Similar to Volcarona, Slither Wing's main outfit has a more appropriate hair, the very fluffy piece, but due to massive clipping her alternate sets are using the standard tied-up knot. Still, there are some angles, like in the screenshot above, where some clipping could be avoided.
Iron Moth is the next Paradox, but it'll she'll be released closer to the end of this month.
Enjoy!