So as I'm sure you've seen, pokemon now have a base underneath them when you encounter them or view their info pages. Here are all 18 of them:
(https://rmrk.net/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FIy6YLe1.png&hash=000a444579026d6346bab87d3dc5e95f928e3071)
0 is fully transparent. 18 is faint, for flying pokemon whose sprites are actually flying (pidgeotto for example). Find the bases file attached, feel free to offer suggestions for fixes. Or offer new base images, if you like.