My question is about Mightyena ferocious bellow
During your opponent’s next turn, the Defending Pokémon’s attacks do 50 less damage (before applying Weakness and Resistance).
If I evolve that defending will my opponent still take less damage?
The opponent will take less damage
Even if it’s evolved, the defending Pokémon is technically the same Pokémon, so it will deal 50 less damage to the Mighteyana.
Hope this helps!