If god created the deil and god is pure where did the devil get its evil side?
To answer this, we must look first at the definitions and relative positions of good and evil. God, as the Supreme Being, is what is known as the Ultimate or Highest Good and the source of all goodness. Also, as the Supreme Being, He is the Ultimate Cause of everything; everything that is, He brought into existence. Now, since He is good, all that comes from Him is good, including the existence which He gives to all of creation. It is because of this fact that we are able to say that whatever is, is good, at least insofar as it has existence.
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The part where Lucifier tries to overcome God and take over him, is mentioned in Isaiah 14: 12-14 and in Ezekiel 28:17 This is when God throws him down from heaven along with his followers.