As far as we know, the only way to evolve Haunter into Gengar in Pokemon Legends: Z-A is through trading. This means you need ...

Haunter can only evolve in Pokémon Legends: Z-A through trading. As long as you have a Haunter and a trading partner, you can ...

Unfortunately, there is only one way to Evolve Haunter into Gengar in Pokemon Legends Z-A, trading. That is right, almost ...

These Pokémon need evolution stones, found around the city, to evolve in Legends: Z-A: These Pokémon need items, either held ...

The reason Gengar’s evolution requires a trade in Legends Z-A is that the developers removed alternate mechanics that existed in some other games (like linking cord or special evolution items).