Okay, here's my doctor brown townysis.
First, the colorset is way too small. 19 colors is very minimal for a colorset, especially when 12 are shades of RGB, and 7 are shades of yellow. Adding a lot more variety would help. I know you said it was for your VGRP, but if you're going to release it like this, no ones going to use it.
Second, the Pikachu sprite you made doesn't even use the colorset. White, brown, and black are on the build, yet nowhere on the colorset. How does that work?