RB lvl 1: 50,000 HP // 50 SH
RB lvl 2: 150,000 HP // 150 SH
RB lvl 3: 300,000 HP // 300 SH
RB lvl 4: 500,000 HP // 500 SH
RB lvl 5: 750,000 HP // 750 SH
RB lvl 6: 1,000,000 HP // 1000 SH
RB lvl 7: 1,500,000 HP // 1500 SH
RB lvl 8:
RB lvl 9: 2,500,000 HP // 2500 SH
RB lvl 10:
RB lvl 11:
...
RB lvl 30: 25,000,000 HP // 25000 SH


SH amount according to the event-details.

lol like i already siad, that event should be cleared in no time xD (or to be exact, you should get enough sweet-hearts, to clear the shop, very easy)

the only challenge is, to kill all RBs to get their rewards...