Well it turns out that I was completely incorrect: Rosemon's Lure is always your prize after the first win against her, but there is one other card you can win, and for this one, you have to defeat Rosemon ten times, without leaving the Battle Caf, without losing once
If you're a fan of Zorua and Zoroark, then you'll want to open packs from White Flare rather than Black Bolt, as this set is home to all of your illusion Pokemon needs
The card effects are charmingly thematic, too, from a raging Beast breaking items, to the song card Mother Knows Best sending a character back to their hand
Witherbloom Pestilence: There's trouble brewing when Dina leads your Witherbloom forces, so prepare the Pests for sacrifice
However, Player B can chain his Set "Divine Wrath" to negate the activation of this effect