Just wanted to echo the sentiment that you are doing absolutely fantastic work here, and any effort you put in is appreciated by me especially, as I'm doing a mashup generation game with many complicated sprites in Gen 3 style. Your Ghetsis especially is something special. I couldn't make anything close to that good!
I see others making suggestions, so if I were to do the same, I would love to see the remainder of the Johto gym leaders done in your style.
You already did Bugsy and Falkner, which are very nice, so I'd love to see your take on Whitney, Morty, and Pryce especially.
That's me being selfish though. If you actually intend to do every single character in every generation, then I'm more than happy to wait. I'm sure you are inundated with request as it is, so either way just wanted to say you are doing spectacular work. I think you have a real talent for this, no word of lie.
Stuff like this is what makes Pokemon fan game and creation such a unique and vibrant field! Keep it up!