Ruling Kecleon V.S. Black Kyurem EX

[Kecleon-X]

So this Kecleon is coming out next set:

Ability: Color Change
While this Pokemon is your Active Pokemon, its type is the same as your opponent’s Active Pokemon.

[C] Copy: Choose an attack on the Defending Pokemon. If this Pokemon has the required Energy to use that attack, it performs the attack.


And Black Kyurem EX is:

My question is, does Kecleon have to discard the energy when he uses Black Ballista?I'm pretty sure this has come up before during the Zoroark and Reshiboar craze, but I can't remember.

EDIT: Wait, I just read Kecleon's attack thoroughly. My bad. But what about Zoroark?

http://www.http://google.com/.com/wp-content/uploads/71-zoroark1.jpg

 

[CarlosDuranJr]

We can't issue rulings on cards not released in English yet.

As for zoroark, you do as much as you can. If you have 3 energy on it and copy black ballista, you discard all 3. If you only have a dce and foul play black ballista, you discard the dce.

 

[DNA]

To add...

You only really get stopped is if there is a restriction built into the attack itself - something along the lines of "If you can't do ________, this attack does nothing". A perfect example is Lugia EX's Plasma Gale - the user must discard a Plasma Energy or the attack fails.

This also relies to optional conditions you can't fulfill - such as Landorus EX's Land Judgment; if you want the extra 70 damage, you have to discard at least 1 Fighting Energy from the user.