In philosophy it states that opposites are necessary in order to create the universe. If this is the case, since one polar is considered to be "good", the opposite polar being "bad" or in the case presented "evil", is evil a necessity for order?

By the limits given in the question, yes evil is required for 'order' to exist. The problem is that with the terminology you're using you fail to accept that evil can in itself be a form of order, while 'good' deeds can also be chaotic in nature.

Another view to consider is that any action may be considered good or evil depending on the viewpoint of someone outside the events. Also only by comparison can we truly state whether something is indeed good or evil.

In a world where everyone obeys the rules and respects one another there would still be those who would be viewed as less pure, or more evil, than others. By comparison in a world ruled by greed and self-interest there would be those who were deemed to be less evil than their compatriots.

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