I thought I'd just ask you directly, since I'd probably get an answer faster that way:
Does Shell Smash Cloyster absolutely have to run a Speed boosting nature? Or can it get away with using an Adamant nature? I had gotten an Adamant Skill Link Shellder a while ago with Icicle Spear and Rock Blast, EV trained it, and got it to level 56. Then yesterday I got one with the moves, ability and a Jolly nature. I'm kinda lazy when it comes to this stuff, and would rather not train a whole other Shellder. But if it really makes a difference, I guess I'll have to...