>>53748700Let's see how this goes.
You attack for 5 damage and the mightyena is now at 9 HP. Mightyena uses it's special move and deals 3 damage. You are at 6HP
Next turn, speed tie. You go first and attack for 5 damage again, lucky you. Mightyena is at 4 HP and it does use it's final special and deals 3 damage. You are at 3 HP. It's getting close
Final turn. You are first and attack for 4 damage and win luckily.