It doesnt tell you specifically to fling this card at your opponent, but if youre sat across the table from someone while you battle, as is usual for card games, theyre right in the firing line
As such, having a creature that can block over and over again and successfully dissuade all attacks can make a tremendous difference
Jigglypuff is no slouch either, using the Lullaby attack to put the opponents active Pokmon to Sleep can buy precious turns while trying to build up your boardstate
Giratina can be used as a wall against high-damage threats such as Darkrai ex and Weavile ex
7 Trials to Glory: World Championship Tournament 2005 - SteamGridDB
Start with the legendaries in play, and turn the rebel into a copy of Atsushi, the Blazing Sky