A new spriter appeared! You've got a lot of work already so forgive me if I can't touch on everything.
Your mixes are pretty good. You've definitely grasped splicing and recoloring, though some of them don't work for me concept-wise (like the Wobbuffet/Beautifly one), but I guess that's normal with splices. The 'Bayalga' is the only one that really stands out to me since it doesn't seem well blended at all. The Dialga crest isn't angled the same way the Bayleef is and the body looks too dark.
I'm not feeling your straight up recolors though. Purple and green (neon green) don't go together so well. The ones where you switched the normal colors (Koffing, Venonat, etc.) are also a little funny because the parts of the sprite that were dark are now lighter and vice versa. Again, recoloring is a bit of a novelty for sprites anyway so it doesn't always matter unless you're going for a specific effect and yours seem just to be for fun or practice.
I like your neon-glow type outlines. It's the first time I've seen someone do this. Puts me in the mind of shop signs. Two colors were just what you needed to get that effect. Very nice.
The revamps are fine, particularly Kingler, though I feel like there is too much contrast between the light and dark colors on Bulbasaur. The medium turquoise shade looks too close to the light shade, but maybe it's just the placement of the shades being dictated by the old sprite. Either way it doesn't quite feel revamped enough to blend in. Devamps look good to me. Not sure what I can say about them.
Your Squirtle has some short arms and the spots look like dirt or bruises to me. The shading is pretty good, but the arms don't really stand out as much as they could. They get a little lost in the body.
If you're planning to stick with splicing and recoloring I think you'll have no trouble at all, though you might want to challenge yourself and mix 3, 4, or even more sprites together so you get some really weird/interesting results. You could also try scratching new sprites, perhaps new poses or fakemon (if you care for fakemon).
Good work. Keep the sprites coming.