I like the designs of your trainer sprites, but the sprites themselves need a bit of work. The outlines on the girl's arms are kind of patchy, and her hands... Well, they don't really look like hands. It also seems kind of inappropriate for the dress being flipped up so much on a girl that age.
The male protagonist's arms are even worse; they're too thick, too short, and the left arm has a crazy-long diagonal line. The arms should be long enough to reach four or five inches below the pelvis. Another problem is the bottom of the shirt. The shape and color of the line makes it seem more like the top of the pants than the bottom of the shirt, which in turn makes it look like the torso and legs are from two different people. The long straight line going up from his right hip doesn't help.
I like the rival's design, but his head looks kind of flat. You can easily fix this by making his hair a pixel taller, and maybe making the topmost horizontal line a pixel or two shorter. Just a heads-up, but you should stop asking people to rate your sprites; it gives a bad impression.