Strongest Counter:
* Hydreigon: This Dragon/Dark-type Pokemon is a fantastic counter to Dragon-types, with powerful moves like Draco Meteor, Dark Pulse, and Flash Cannon. It's also immune to Dragon-type attacks.
Other Good Options:
* Haxorus: This Dragon/Dark-type Pokemon has high Attack power and can learn strong Dragon-type moves like Outrage.
* Garchomp: This Dragon/Ground-type Pokemon can hit Dragons super effectively with its Ground-type moves like Earthquake and can also use powerful Dragon-type moves.
* Krookodile: This Dark/Ground-type Pokemon can hit Dragon-types for super effective damage with its Ground-type moves, and it also has high Attack power.
* Chandelure: This Ghost/Fire-type Pokemon is immune to Dragon-type moves and can learn strong Fire-type attacks like Flamethrower and Shadow Ball.
Things to Keep in Mind:
* Dragon-type moves: While these Pokemon are great against Dragon-types, remember that they themselves are weak to Dragon-type attacks, so be careful using them against other Dragon-type Pokemon.
* Type Advantage: Remember to utilize type matchups effectively. A strong Fairy-type Pokemon like Gardevoir or Sylveon can also do a lot of damage to Dragon-types.
* Status Conditions: Utilize moves that can weaken the Dragon-type, such as Thunder Wave to paralyze it or Toxic to poison it.
* Stealth Rock: Consider setting up Stealth Rock, which will deal damage to any Dragon-type Pokemon switching into battle.
Ultimately, the best Pokemon to defeat a Dragon-type in Pokemon Black and White depends on your specific team composition and the type of Dragon-type you are facing. Use your knowledge of type matchups and your Pokemon's strengths to your advantage!