With a whopping total score of 85 out of 100 in its early reviews, Pokemon Legends: Arceus' release has been an overwhelming success, debunking many of the issues that several fans thought it would have. There are also quite a lot of creatures to catch, and Pokemon Legends: Arceus players who want to discover how they can evolve Haunter into Gengar in this new game can use this quick guide to learn how to do just that.