Each time you steal a creature, you see an additional card on your next upkeep, which increases your odds of playing more creatures, and so on
Some of the most valuable cards from the HeartGold & SoulSilver era have been flying under the radar as other eras command attention, but prices are rising all the same
Back during this era, rotation would always happen after Worlds (then switched to right before Worlds, then switched to mid-season)
If it wasnt for the remakes of these games, Id say theyre still worth a play, even if the black-and-white graphics and absence of some of the deeper systems like split Physical/Special Attack missing can make them hard to go back to
Then, she also has Bodyguard, which will allow her to keep your other cards safe for a challenge or two
Sword/Shield sets are legal until 2025, whereas Scarlet/Violet sets will be legal for even longer