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Ferrothorn getting Rapid Spin would probably lower Starmie and Forretress usage.
I'd like to imagine that there would be teams that would based off Regigigas in that situation, but I don't think Sub+Protect would help him all too much considering the threats that you mentioned. Magnezone and Stallbreaker Mew would be two very good friends to it, but Conkeldurr would be a burden to the team, though.Regigigas would be interesting with Rest and/or Protect. I was having this discussion with Blitzle, but I really don't think he would be overpowered in today's game. The most 'centralizing' he would do would be ensure that most people run powerful Fighting types or appropriate phazers. I would have to do a calc, but I would think something like Mienshao HJK would be sufficient to take him out. Protect would let him get past slow start sometimes, but that makes him setup bait if he does it too predictably. There is also Skarmory to phaze in OU (Fire Punch won't do that much until he gets his full Attack stat).
I would say that ferrothorn should get rapid spin.It looks like a poke who can spin and he can easily come in against bulky waters and spin the hazards away.
And he can also beat jellicent and gengar if he uses power whip on the switch.
I think that Pure Power Slaking in OU would certainly be be analogous to Reckless Staraptor in UU. It wouldn't last very long before being banned.
Rapid Spin on Ferrothorn would be nice, but I think that it would make the Pokemon suffer from moveslot syndrome. Ferrothorn more or less needs both Power Whip and Gyro Ball to check various threats.
@Angad
Ferroseed is clearly spinning in b/w sprites.
Lets not forget that forretress also has rapid spin and almost the same kind of attacks.And foretress functioned fairly well in Gen4.
A set of:
Rapid spin
Spikes
Power whip
Leech seed /gyro ball
can work.
And gengar takes a crap load from power whip due to its stupid defenses anyway.
4 HP Gengar takes 35.2% - 41.4% from Power Whip, Hidden Power Fire always KO's Physically Defensive Ferrothorn, and almost 1HKO's Specially Defensive Ferrothorn, It just needs some prior damage.