DARK CLOAK vs TANGLING TENDRILS

[peejay_whip]

With reference to http://pokegym.net/forums/showthread.php?t=121577

would the same rule apply for Darkrai EX's Dark Cloak versus Victreebel's Tangling Tendrils?

Thanks..

[PokePop]

Check out the Meta Rulings section of the Compendium.
It covers general situations that are easy to apply to many card interactions, including this one:

http://compendium.pokegym.net/compendium-lvx.html#c2

from the MetaRulings section:

If a Retreat Cost is set to zero by an effect, it cannot be increased. Note this is different than a Retreat Cost that was reduced to zero by subtraction. (Jan 31, 2008 PUI Rules Team)