Also, is this set useable?
Cloyster @ white herb
Trait: Skill link
Evs: 252 spe, 252 atk, 4def
to get a shellder with rapid spin and rock blast quickly you need to breed a female almaldo with a male staryu which learns rapid spin at level7 and you will get an almaldo (hopefully male)
with rapid spin and then level it up to level 61 and it will learn rock blast then breed that male almaldo with rock blast and rapid spin with a female shellder and you will get a shellder with rapid spin and rock blast and as for the move set, i'm not good at judging but it looks ok