You're gonna be receiving a warning for that spammish comment. Pixel Art rules require constructive criticisms when posting, so a lack of such is prohibited so that the members benefit more and the quality of posts in the section are raised.
But the other posts didn't have constructive criticism either.
I was trying to make a Gym leader for my friend's project. =/
It's a really weird base to use. The editing is pretty minimal and you can can easily tell it used to be the Bird Keeper from Fire Red and Leaf Green. You should try adding different expression, different hair style, add props from scratch, and change the pose more so that it's not as obvious. This is a huge problem for all of your trainer edits, they just look too obvious. The Pokemon breeder edit is obviously wearing Brock's pants from Fire Red and Leaf Green and they don't fit right on the character.
The sprite's head looks very awkward on his body, and the left leg should not be the same length as the right. It should be at least one pixel shorter than the other leg, and it looks like he was sewn onto someone else's body because blow the wait doesn't match to the top. Correct me if I'm wrong, but the bottom half was from a taller sprite. You should try to reference more while working on your sprites. You could have the original sprite in your work space while you edit it.
Also the shading is bad, I couldn't tell where the light source was coming from. Almost all Pokemon sprites the light source if coming from the north-east, but your light source is coming from the north-east the west. Proving that you did past the bottom half on. Now, there isn't anything wrong with pasting parts on, you just have to be mindful when shading and pose.
Which brings me to the pose. His torso is turning in one way while his legs are turning in another. This could be easily fixed by mirroring the image, but if you do not have a fancy photo editor, you can mirror the part by scratch. It isn't not very hard, but you will have to look at the part in normal size. I have ran into that problem as well and had to make mirror images of the part I wanted to use.
Also, if you want a professional look, you can always make the sprites transparent by downloading a free raster graphics editor. Most free raster editors have basic editing feature that you need like cropping, flipping, and layering. These certain tools are very important and helpful when spriting. Also, you would want to make a palette cart. Not every advance Pokemon game has the same palette.
Now I'm not claiming to be a spriting expert or anything, but you really don't have to be an expert to gave critique. My sprites aren't amazing either, but I do hold basic tips to heart.
If you want, I could show you a sprite I did where you could never tell what base I used. It looks completely from scratch even though I took many "short cuts".