I got a moveset for regigigas that I'm wondering if it'd work...(it's supposed to be a improved staller set...)
Regigigas @ Leftovers/ Expert belt
Nature: Adamant
EVs: (i need help with this....)
Confuse ray
Thunder wave
Rock slide/ Iron head(platinuim only)/ Zen headbutt
Focus punch/ Brick break/ Stone edge/ Earthquake/ Thunder, Ice or Fire punch
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Like Rascalrock, you parazlye with Thunder wave, then use Confuse ray (or vice-versa if you prefer)
to make the foe unlikely to attack, then try to keep them from attacking more by making them flinch with Rock slide, Iron head or Zen headbutt.(Rock slide helps counter Gyarados, if you decide not to use Stone edge for your 2nd attack, Iron head has the most power [tied to Zen headbutt] & has 10% more of a chance to make the foe flinch than Zen headbutt, & Zen headbutt hits Infernape, Machamp & Heracross [the fighting-types you'll see most in OU, I belive] super-effectily, as well as Gengar.)
For the "sweeping" attack, Focus punch is the most powerful 1, & it's have a good chance to work, since the foe most likely will either be too paralzyed to move, or hit itself in confusion.(plus, even with resisted hit, it'll put a large dent into any pokemon, as long slow start is gone & your foe is not a ghost) However, if you don't want to rely on paralzsis & confusion, use Brick break instead,of which has the bonus of breaking Reflect, as well as other screens. If you're worried about Electivire swicthing into Thunder wave, use Earthquake to nip it's naughty plans in the bud. If you're more worried about Gyarados, use Stone edge, of which will work agaist others treats that's weak to rock, like aerodactyl. Thunderpunch would do more damage to Gyarados, but Electivire may swicth into it...(if you insist on using Thunderpunch to attack water & flying type treats, make sure that your rival don't have Electivire, or elimate it first.) Ice punch is for Dragons, of which will be more fearsome on Platinuim, due to Outrage being avaible to them, & Fire punch is for Forretress, Scizor, Skarmory, Metagross & Bronzong of which I belive are all consdier to be top-tier pokemons...The item choice depend on what you like better: more survivability, or to counter treats better.
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I belive the EVs for Regigigas should be like this:
It have enough defensive EVs to take at least 1 choice banded Close combat from Heracross,
& 1 Focus blast from Gengar, (it then can ruin them with Zen headbutt[if you have it] & Thunder wave &/or Confuse ray)
& the rest of the EVs should be focused into it's attack...