There is no specific "RB Bat" pet; however, the term likely stems from two popular topics often searched together:
Located on the grey cement bridge leading toward the castle. Blue Crystal: Found near the campsite and the red bridge. Adopt Me Script – Complete The Challenge RB Bat...
Touch the RB Battles Trophy at the peak to receive the badge and a limited-time pet wear item. Clarification on the "RB Bat" There is no specific "RB Bat" pet; however,
Stand near each crystal until it glows, indicating it has been collected. go to the upper floor
Enter the castle, go to the upper floor, and use the trampolines/jump pads outside to reach the very top.
Located near the hot springs and the Baby Shop. The Final Objective: