This list showed the first and third stages of various Pokémon evolutions. The missing Pokémon are Silcoon, Wartortle, Vibrava, Haunter, Pupitar, Cascoon, Pidgeotto.
Since the missing mon in each case was a middle evolution, the extracted answer is meant to come from each name's middle letter. Together they spell CORNICE, a term that can also represent the middle or meeting of two areas.
|The answer is: cornice|