>>45336804Something in the same vein as those images with the "generic" designs for each gen. Look for common elements in your mons like pic related and combine everything into a three-stage line, tastefully of course. Optimally you'd do this once you have the rest finished, so I'm afraid I'm not being very helpful.
Other than that, how about a caterpie-type of deal that evolves into a cocoon and then a fast moth pokemon with Volt Absorb and Reckless?