>>20699503I thought Mega Gengar was enhancing its trait of hiding in the shadows like the Pokedex says regular Gengar does. If you didn't notice, half of Mega Gengar's body is actually sunk into the ground or well into a shadow. I think that's why they don't let you see the bottom of it in the Pokedex since there's nothing there. Mega Gengar also has legs if you didn't know.
As disgusting and weird as they might look at first glance. They aren't so bad when you realize its arms also have the same girth.