Warning: Picture is large.
I drew these in a few minutes, so they still need some improvement.
Top Evolution Line: Based off of dolphin and swordfish. Surf encounter or water starter? Final form Water/Fighting or Water/Ghost.
Second Evolution Line: Based off vampire bat or Dracula. Ideal "evil" Pokemon. Cave encounter.
Middle Left Evolution Line: Based off traffic light. 3 forms. Found near urban areas (if there are any).
Middle Evolution Line: Based off spider. Could use a little work.
Middle Right Evolution Line: First stage is boulder with karate belt. Rock/Fighting. Based off golem and sumo wrestler.
My only request for Del is for him to have blond hair. Feel free to make his clothes any color.
Feel free to give comments or any constructive criticism.