Royal Rainbow Burst is an upgraded form of the attack Rainbow Burst.
The girls activate the Princess Wands and transform into Glitter Princess Mode like in Rainbow Burst, but after that Lucky activates the Royal Clock by inserting a special Glitter Charm onto the empty medallion and runs her two fingers on all of the numbers and Candy helps by jumping on the pink button. After that the clock strikes a number and the Phoenix appears. Then the girls do a flying routine, aims and lets the Phoenix fires the attack.
The Pegasus from Rainbow Burst is replaced with the Phoenix.
The girls' Pegasus figures are shinier.