I must say, I am very impressed with this. I'm also a spriter, and haven't done too terribly much in my career, but I have to ask you this: Are these all scratch sprites?? If they are, then hats off to you, good sir.
I've never, ever, ever been able to scratch sprite in any way, shape or form. The people I have seen do tutorials of on youtube were never that impressive, but these are simply amazing!
Even if you didn't scratch these, I never would have been able to tell that these all were originally real Pokemon!! I do see that on Denki, you have Emolga's colour palette, and what looks like Emolga's ears, and Frostel's head is Lugia's. Chargebeet and evolutions have Joltik's colours, too.
The outlining is fairly smooth, and the shading is pretty good, even if it is a little monochrome, if you excuse me. I'm quite impressed with your first Trainer sprite, but I do have some things to criticize.
First off, the pose in general doesn't look very comfortable. If he could possibly be a little more upright? The collar as well, it looks a little bit... awkward. Other than that, the shading and outlining is excellent!
The mugshot, however, doesn't look right. The eyes look sad, and the PokeBall is massive. Not to be rude, but I doesn't get my approval as a spriter.
Other than the aforementioned problems that I spotted, I highly encourage you to continue! These sprites are simply stunning, and from one spriter to another, I highly recommend you to continue with this project of yours!
*~Maelstrom~*