Pokémemories: Volo
In Pokémon Legends: Arceus, Volo is an ancestor of Sinnoh Champion Cynthia who, as a member of a merchants guild plus a historical research enthusiast like his descendant, helps you throughout the game, including at your lowest point of being banished from civilization.
And then in the postgame, you find out it was all a ruse and that he's the villain of this story.
In fact, not only is he the villain, but he's also one of the most psychopathic in the franchise with one of the much horrific goals - destroy the universe and make a new one that he can rule over as a god, but unlike Cyrus not with the same people and Pokémon as before - and also among the most powerful, as the battle with him is long and difficult. You first have to fight all 6 of his Pokémon as expected, but then he summons his true partner Giratina whom you must fight, and then after being defeated Giratina transforms into its Origin Forme with fully recovered HP and you have to fight it again! And did I mention that your life is in danger?
Volo - even if you defeat him, he'll still be haunting you forever.













