Enter the castle, go to the upper floor, and use the trampolines/jump pads outside to reach the very top.
Touch the RB Battles Trophy at the peak to receive the badge and a limited-time pet wear item. Clarification on the "RB Bat" Adopt Me Script – Complete The Challenge RB Bat...
Use a flying pet or ride the hot air balloon (which costs 5 Bucks) to reach the Sky Castle. Enter the castle, go to the upper floor,
Stand near each crystal until it glows, indicating it has been collected. Enter the castle
There is no specific "RB Bat" pet; however, the term likely stems from two popular topics often searched together: