Veruld (Fates Pokémon) is a legendary Ghost/Dark Pokémon who can decide who dies by cutting their life strings.
She got mad with power once and was sealed away by Arceus deep underground and in half-stasis only being awake enough to do what she was appointed to.

Rackatoskr (Messenger Pokémon) is a mythical Fairy/Grass Pokémon who brings messages between legendaries but will also cause mischief on the world.
Do not be fooled by this cute fella, if it would find something funny in causing havoc, then it will do so.