Ruling Regirock LA - 'Regi Cycle'

[heyboy963]

I was building a deck using Regirock from LA when I took a closer look at its power.

It states this:

Regi Cycle - Once during your turn (before you attack), if you have a {F} Energy card in your discard pile, you may discard 2 cards from your hand. Then attach a {F} Energy card from your hand to Regirock. This power can't be used if Regirock is affected by a special Condition.

I re-read it, and found it stated that you needed the {F} Energy in your discard to use this power, prior to discarding your cards.

Would this mean that you can't use the effect, discard the {F} energy as one of the two cards, then attach the same one if you don't already have the energy in your discard?

 

[DNA]

You are not allowed to discard whatsoever, if you don't have a {F} energy in the discard pile already.
However, if you do discard, and 1 of the cards is a {F} energy, you can choose to attach the card you just discarded.

Junk Arm works the exact same way - you can't discard unless there's a Trainer (except Junk Arm) in the discard pile to begin with, but if you discard 2 cards, 1 of which is a (not Junk Arm) trainer, you can pick up the card you just discarded.