The Rocket trainer card "Recall" allows you to use an attack from the
Pokemon you evolved from, as long as you pay the energy costs.  In Neo 3,
Aeorodactyl's pokemon power will do the same.
The Neo Onyx with 60 HP has an attack that does 10+ 10 for each damage
counter, which would be the number of counter on 110 HP Steelix.  The
requirement is 2 fist.  By placing Rainbow energies on Steelix, you add 2
counters, plus you can change what type they are depending on the attack you
chose: Rainbow can change from metal to fist whenever you decide. 

paul_young@gage.com