I'm guessing this is for anti-Sandstorm. Fire Blast roasts Steels. Surf takes down Grounds and Rocks. I don't think Gyarados would switch in due to the potential Thunder Wave anyway. Slack Off seems better.@Mr. Stone. As far as I can tell that a nice set except maby add to HP evs instead of maxing both offences. To give him some bulk since if he's gonna be phazeing he's going to have to take some hits. But just a random idea.
I've been using this for a while and it works suprisingly well.
Unchill Bro
Slowbro
Regeneration
Bold
200HP 252def 56SpAtk
lefties
Moves:
Psychic
Fire Blast
Surf/Slack Off
Slack Off/Yawn
Yeah I know it looks kinda weird, but it destroys roob with psycic and is slower so takes nothing from from payback. If your afraid of gryados run yawn to prevent set up and phase in general. If you don't need phazeing you can run slack off and three attacks. Fire Blast destroys ferrothorn and hits skarm like a truck it lures both of them in very well for a unhappy surprise. Regeneration allowed it to even take pursuits from tar or it can stay and yawn it and force it to switch. And even if you run fire blast, psycic, slack off, and yawn it's highly unlikely for heatran to switch in for fear of a STAB surf.
This is my first attempt at a set but please give me honest opinions.
I think 252 HP / 144 Def / 56 SpA / 56 SpDef and Calm Nature would be better. You can survive Shandera's Shadow Ball after Stealth Rocks all the time and KO it back with Surf. You can switch out later for Regeneration. Boil Over is also an option which also can KO Shandera after Stealth Rock. I'm not sure what the 56 SpA is for, but 36 can KO Shandera after Stealth Rock.