Located on the grey cement bridge leading toward the castle. Blue Crystal: Found near the campsite and the red bridge.
There is no specific "RB Bat" pet; however, the term likely stems from two popular topics often searched together: Adopt Me Script – Complete The Challenge RB Bat...
Stand near each crystal until it glows, indicating it has been collected. Located on the grey cement bridge leading toward the castle
Located near the hot springs and the Baby Shop. The Final Objective: Located near the hot springs and the Baby Shop
To "Complete The Challenge," players had to locate and activate three hidden crystals (sometimes called totems) across the main map of Adoption Island:
Use a flying pet or ride the hot air balloon (which costs 5 Bucks) to reach the Sky Castle.
Touch the RB Battles Trophy at the peak to receive the badge and a limited-time pet wear item. Clarification on the "RB Bat"