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Moves determined by CP & IVs?
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As everyone said it is totally random, you are just having bad luck. I am also having really bad luck with all my grass type mons (except Venusaur which got the best offensives moves on first try), I have now evolved 6 Victreebel (no one with 2 grass moves) and 5 Vileplumes (again none with 2 grass moves).
Just keep trying, and good luck ;)