It is the ability to do absolutely everything that is logically possible. Now, do you honestly understand what perfect knowledge of the future is? This is a point I addressed you with for five posts and you ignored it each time. You make the positive claim that evil can never in the future result to some positive good. Without out knowledge of the future, how can you make that claim?
This is without even getting into your anthropocentric view of the universe, which is also terribly flawed and presumptuous, without any positive evidence.
No one said that evil cannot have a future good result, but an omnipotent being can make the good result happen without evil. And omnipotent being don't have to compromise with anything, it can make everything go perfectly without evil if it wanted. Since an omnipotent being can do anything and knows everything, nothing is impossible for it, so using evil or allowing it to exist is completely a choice for such a being, it doesn't have to use it to get what it wants, because by definition an omnipotent being could make a world that gets the benefits than the introduction of evil,would produce without having to actually allow evil to exist.
However, omnipotence alone doesn't mean that such a being wouldn't just choose to allow evil to exist anyways, so an omnipotent god could exist.
Then we have a 100% benevolent being. Such a deity would never allow for evil, suffering, etc. of it could avoid it, because by definition a benign entity wouldn't want these things to happen. However, benevolence alone doesn't mean that the deity could avoid it, it might need to make a compromise, the options could be limited, therefore a benevolent deity could also exist.
But then people present the idea of a deity with both traits. Now a being which doesn't have to allow evil to exist nor wants evil to exist would never allow it to exist, because it would never have to make that compromise and it would never want to. Because if a being which is entirely good dislikes sin and suffering, and this same being is perfectly capable of making a functioning universe without sin or suffering ever having to be present, it wouldn't. Our universe definitely had suffering, pain, etc., thus, it could not possibly have been created by a being which is both all powerful and all benevolent.
You don't need to understand any particular deity to know that a being which has a dislike of evil, which can also remove the presence of evil or never make it exist to begin with, would never let evil exist/create it to begin with.
Note, a deity which has one of these traits and is close but not quite having the other can exist, it just cannot have both and be the creator of the universe. In my personal opinion, in observing what the universe looks like, I would say if it was created by a deity that being didn't have either omnipotence or complete benevolence. There are way too many mistakes/inconsistencies for omnipotence, and there is far too much suffering for complete benevolence, in my views.