Code:
Butterfree:
~Iron Defense + Double-Edge,
~Iron Defense + Mimic,
~Iron Defense + Nightmare,
~Harden + Morning Sun,
~Iron Defense + Morning Sun,
~Tackle + Morning Sun;
Beedrill:
~Iron Defense + Double-Edge,
~Iron Defense + Mimic,
~Harden + Baton Pass,
~Iron Defense + Baton Pass,
~Poison Sting + Baton Pass;
Bug Bite and String Shot tutors reduce the number of combinations here.