Max out 1 and 2. Put them in gyms or save #2 for attacking (personally I kept mine at 16xxCP for prestiging since I rarely attack gyms).
I wouldn't worry too much about the two others, even though they are decent all-rounders. Legacy Exeggutors will be better defenders and Solarbeam is a much better option for attacking. Evolve the 96% one if you still have candy laying around.