I started by talking about the idea of the omnipotent, omniscient and all benevolent God.
Prominent examples are the Gods of the Quran and Bible.
From that perspective, evil is the sin he will punish evildoers for. As narrated in the Quran and Bible.
If there was no evil, there is no ground for punishing sinners and evildoers.
If that God punishes evildoers/sinners, for thw wvil thwy havw done, then, from that narrative, evil must exist.
But that proposition begs the question.
Why would an all knowing, all loving and all capable God create a universe in which evil is possible, when he could have simply created a universe in which evil is unknown and not even possible?
This question presents an unsolved contradiction.