In my opinion, only human are good or evil, not God. Assign this human things to something that we dont know if exists or not, is an error and a way to avoid our own acts.
God created this world and man. And people themselves make this world good or evil. It all depends on who is treating different things and situations. And there are more good in this world.
If God created all that is on earth, then God created the evil also. Most likely for balance or for people to have an understanding of why good should be good. Although evil exists not only in the world of people. Among animals this is also seen.
Evil must be for balance, but God can not create evil. Evil is creating evil. Then the question arises who created God and the devil?