Shuppet

“SHUPPET is attracted by feelings of jealousy and vindictiveness. If someone develops strong feelings of vengeance, this POKéMON will appear in a swarm and line up beneath the eaves of that person’s home.”

— Pokémon Ruby

“SHUPPET grows by feeding on dark emotions, such as vengefulness and envy, in the hearts of people. It roams through cities in search of grudges that taint people.”

— Pokémon Sapphire

“This POKéMON roams about deep in the night seeking such negative emotions as grudges and envy. It retreats to its nest when the sun begins to rise.”

— Pokémon Emerald