Level up (if you got a Bowser clone):
Bowser [13] - HP
Peach [13] - HP
Level up (if you got a Mallow clone):
Peach [13] - HP
Level up (otherwise):
Geno [12] - ATK
Climb the vines
If you got less than 5 flowers on Booster Hill, collect the flower from the first chest you see
(video credit: V0oid)
LAND'S END | BEAN VALLEY | NIMBUS LAND