Ultra-sun: On moonless nights, Haunter searches for someone to curse, so it’s best not to go out walking around.Moon: It fears the light and revels in the dark. It may be on the verge of extinction in cities that stay brightly lit at night.Alpha-sapphire: Haunter is a dangerous Pokémon. If one beckons you while floating in darkness, you must never approach it. This Pokémon will try to lick you with its tongue and steal your life away.
Prof. Lotus' Notes: Haunter is possibly a portmanteau of Hunter (due to it's stalker nature), haunt and Spectre (Haunter's original name in the Pokemon Red / Blue beta). Haunter is one of 4 of the lightest Pokemon weighing in at 0.1KG.