This is specifically concerning the middle evolution, and not the first or second stages.
Ivysaur (Grass)
Charmeleon (Fire)
Wartortle (Water)
Bayleef (Grass)
Quilava (Fire)
Croconaw (Water)
Grovyle (Grass)
Combusken (Fire)
Marshtomp (Water)
Grotle (Grass)
Monferno (Fire)
Prinplup (Water)
Servine (Grass)
Pignite (Fire)
Dewott (Water)
Quilladin (Grass)
Braixen (Fire)
Frogadier (Water)
Dartrix (Grass)
Torracat (Fire)
Brionne (Water)
So which seven of these make your list? (:
[spoiler]I made the image myself using a mobile app, so it may be poor quality.[/spoiler]
-
Gens 7,2 and 5 are best middle evos