When using Rocket's Scyther Shadow image - after you first declare it's use does it remain in effect until the card takes damage?  Is it treated like a Pokemon Power that requires energy or is it a one turn effect like an attack.  What does "Whenever" refer to?
 
Sean
burviking@prodigy.net

Shadow Images's effect works very much like Smokescreen.  The difference is while Smokescreen is an effect attached to the Scyther itself.  So, benching the Scyther would end it's effect.  Outside of that, it will remain active until the opponent can successfully flip a heads thought it and deal damage.  Hope this clears things up a bit!

Scott