you mean new babies (baby evolution as poke-power)[RS-on] or older babies (put 'evolution' on 'name of the baby')?[neo and e- series]
you don't have to flip a coin to attack the new babies, if it's not on the card, then you don't need to do it
if this is not what you meant, try explaining it again
Say, Shedinja's Wonder Guard prevents evolved pokemon from attacking it, then NO WAY u can attack using a Tyranitar or Raichu, for example. U dont flip. It is a straight zero.