Does Will O Wisp Activate Flash Fire?

Will-O-Wisp activates Flash Fire.

Is the flash immune to Fire?

The Pokémon is immune to Fire-type attacks, and its Fire-type moves become stronger when hit by one. Scizor is immune to Fire-type attacks, and its Fire-type moves become stronger when hit by one.

How do you activate flash fire in Pokémon?

Effect. If a Pokémon with the ability is hit with a Fire-type move, Fire-type moves (and later the users Attack stats starting from Gen 4) will be powered up. This ability makes the user immune to Fire-type damage and when hit by a Fire-type move, Flash Fire will be activated.