Here's the breakdown:
* Ghost-type Pokemon are weak to Ghost and Dark type attacks.
* Ghost-type Pokemon are resistant to Normal, Fighting, Poison, Bug, and Grass type attacks.
Therefore, in Black and White, these Pokemon types can be effective against Ghost-type Pokemon:
* Ghost-type Pokemon will be super effective against other Ghost-type Pokemon. This is because Ghost-type attacks are the only type that are super effective against Ghost-type Pokemon.
* Dark-type Pokemon will be super effective against Ghost-type Pokemon.
Important Note: While Ghost-type Pokemon are weak to other Ghost-type attacks, you need to consider the individual Pokemon's moveset and abilities. Some Ghost-type Pokemon may have moves that are not Ghost-type and could be a threat.