Where to get the focus band in Pokemon Black and White?

You can't get the Focus Band in Pokemon Black and White. It was introduced in Pokemon Black 2 and White 2.

If you're looking for a similar item that boosts accuracy in Pokemon Black and White, try these options:

* Accuracy Power Up - Found in the Relic Castle (after you obtain the National Dex) and can be used in the Battle Subway to increase the accuracy of certain Pokémon.

* Scope Lens - Found in the Relic Castle and increases the accuracy of your Pokémon.

* BrightPowder - Found in the Lostlorn Forest and increases the accuracy of your Pokémon.

Good luck finding the right item for your Pokemon team!