There are three main ways to do so: knock out enough opposing pokemon to collect all six Prize cards, render the opposing trainer unable to battle by leaving them no pokemon on their side of the field, or by the technical victory of making one's adversary run out of cards to draw from their deck
Non-foil Special Guests cards appear in Play Boosters, while traditional foil Special Guests cards appear in Collector Boosters
In: Scion of the Ur-Dragon for Bringer of the Blue Dawn The Bringer is fine, but the five color requirement to run it drops it down significantly
Some of these cards would make an excellent addition to any collectors stash
So this is a very situational card, but with the right deck, it can give you the advantage quickly
This classic card, unfortunately, did not get a reprint in XY Evolutions because of the Kadabra situation at the time, making it more illusive than most Base Set cards