How to get Gastly, Haunter, and Gengar in Pokemon Legends ZA

Embark on a spectral quest in Pokémon Legends ZA to capture Gastly in Wild Zone 4, evolving it to Haunter at level 25. For the elusive Gengar, players can either trade their Haunter or directly encounter and catch one during Main Mission 20 in an abandoned building. This guide details every step for trainers aiming to complete their collection.