How do you figure to get Hitmonchan powered up in 2
turns?  What does a Double Colorless have to do with
powering him up too?  He needs 3 Energy requirements
for 'Special Punch'.  2 Fight and a 1 Colorless. 
Double Colorless only fulfill the colorless
requirments - not Fight/Grass/Fire or anything else. 
Whereas, the colored cards fulfull any Colorless
requirement.

According to the rules:
"Attach an Energy card to a Pokémon (only once per
turn)" 
        (aside from Raindance Power)

The rules do not state a basic ENERGY CARD. Just, "an
Energy card."  A Double Colorless isn't a basic Energy
Card but counts as one ENERGY CARD you can attach in
your turn. 

Double Colorless and Hitmonchan really don't belong
together unless it's used in desperate measures or to
retreat.

SO... you need 
2 Fighting Energies and 1 Double Colorless or
2 Fighting Energies and any other Colored card.

That's 3 turns.

I hope this clears up a bit for you. If it was just an
oversight during your writing that's cool.

But I've run across players who have argued this
point.  ThePojo has answered this type of questions in
Q&A and it's also in the rule book.
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