Name a super effective move the Attacking Pokémon could use against the defending Pokémon based on the EARLIEST GENERATION THEY COULD HAVE FOUGHT IN.
Example: Starmie is attacking Steelix, you could use any Gen 1 or 2 move Starmie learns that is super effective against Steelix, as Starmie is from Gen 1 and Steelix is from Gen 2.
Excluding Hidden Power.
In the description, you'll see I said in the earliest gen they could have fought in. Brick Break didn't exist until gen 3. Since Hitmonchan was introduced in Gen 1, and T-Tar in Gen 2, the earliest they could fight is Gen 2. Thus, Brick Break is not a valid response