How do you get the Tm flash cannon in Pokemon black?

You can't get the TM for Flash Cannon in Pokemon Black. Flash Cannon is a move learned by Steel-type Pokémon and it's only available in Pokemon White.

If you want to use Flash Cannon in Pokemon Black, you'll need to teach it to a Steel-type Pokémon by using the Move Tutor, which can be found in Castelia City. However, the moves available for the Move Tutor vary depending on the version of the game.

Here are some Steel-type Pokémon that can learn Flash Cannon in Pokemon White:

* Metagross

* Lucario

* Magnezone

* Aggron

* Excadrill

* Bronzong

* Steelix

If you're looking for the TM for Flash Cannon, you'll need to get Pokemon White or trade with someone who has it.