Need advice [tutorial]

I have 18 purple b stones,14 red,10 blue and green, and 3 yellow What should I evlove,considering I have: Evil egg N003 Teal egg N102 Green egg N104 (yuck) Teal egg N105 Violet egg N107 Teal egg N108 I was planning on evolving N107 or Evil egg N003 Should I save the stones? help.