After receiving Heatguana, the BeastMon hugged you with love as you were now her trainer, and you pet her head more. So, as you decide to keep her forever, you use the Beast-Cube that Heatguana came in, and returned her to inside of it. With the BeastMon inside, the Beast-Cube itself shrinks, and you place it in your bag.
You then walk out the door with your BeastMon. "Wait Lucy, don't leave yet," Rick says. "We should test out how strong our BeastMon are." "How?" You ask. "I challenge you, to a BeastMon Brawl," Rick answers. "Oh Rick, you always have to want something challenging once you get the tool with it," Kao comments. "What's a BeastMon Brawl, Professor?" You ask. "They're basically what trainers do with their BeastMon, when you have them," Kao answers. "Though if you're interested, I'll show you how they work."
"I don't know," You say. "I might need Heatguana to decide." You take Heatguana's Beast-Cube out of your bag, and throw it in the air, which causes it to open, and release her. "Heatguana, Rick is challenging me to a Beastmon Brawl, and I'm not sure what to do," You explain to her. "I want to see how strong you are, but at the same time, I don't want to risk you getting hurt. What do you think?"