Knocking-out a Pokemon When a Pokemon is Knocked-out, its placed into the discard pile along with any energy cards or items attached to it
The Giratina VSTAR Lost Zone engine defined competitive Pokemon for the better part of two years, and that pedigree gives the card a competitive significance that most Crown Zenith cards simply cannot match
You could combine it with cards that remove the creature from combat to let them keep the shield counter permanently, though
Subsequently, Tegwyll, Duke of Splendor is definitely one of the best choices around to helm your deck
Its iconic four-armed design makes it a standout card
It being released at the height of the game's popularity and a highly desirable ex card means that there are probably a lot of copies in existence, although just how many of those belong to accounts that are still active is anybody's guess