Mismagius

Diamond: Its cries sound like incantations. Those hearing it are tormented by headaches and hallucinations.

Pearl +2: It chants incantations. While they usually torment targets, some chants bring happiness.

Platinum +4: Its cry sounds like an incantation. It is said the cry may rarely be imbued with happiness-giving power.

HeartGold +3: Its cries sound like incantations to torment the foe. It appears where you least expect it.

Sun: It appears as if from nowhere—muttering incantations, placing curses, and giving people terrifying visions.

Moon: Mismagius have been known to cast spells to make people fall in love, so some people search for this Pokémon as if their life depended on it.

Ultra Sun: Feared for its wrath and the curses it spreads, this Pokémon will also, on a whim, cast spells that help people.

Ultra Moon: Its muttered curses can cause awful headaches or terrifying visions that torment others.

Legends: Arceus: The incantations Mismagius chants can ward against misfortune, so a custom exists of inviting it into one's home. Incur the Pokémon's displeasure, however, and disaster will surely ensue.