Eh, I think people are being a little harsh to Gigigear, and looking at it all wrong.
Firstly, Gigigear is nothing like a Brongzong cousin. It's more like a Metagross Cousin.
Secondly, due to the dreadful movepool I highly doubt Gigigear will replace Metagross in OU. Or contend. However, I expect it to be fearsome in UU.
However, bear in mind, after a Gear Change, Gigigear is faster than +2 Metagross, AND hits harder with Gear Saucer than Metagross would with Meteor Mash.
The thing is, Gigigear, despite an ABYSMAL movepool, can pull off something VERY few other pokemon can do.
Mixed Set-Up Gigigear
Gigigear @ Leftovers
252 Sp.Attack, 252 Attack, 4 HP
Rash or Any Neutral Nature
- Gear Change
- Gear Saucer
- Charge Beam
- Flash Cannon
Description:
Electric and Steel actually gives great coverage, with no single type resisting both. Gigigear uses it's bulk, combined with it's coverage, to set up and sweep. Gigigear outspeeds even 252 Jolly Swellow after a Gear Change, with no investment, AKA, the whole UU teir. Charge Beam allows Gigigear to beef up it's Sp.Attack, while Gear Saucer will be the main methord of attack after a Gear Change, smashing through Substiutes with more power than Meteor Mash from Metagross after a Gear Change.
Rash is the suggested nature, to help with Gigigear's mixed nature. However, Gigigear's Sp.Def is respectable too, so it's actually perfectly feasable to use a Neutral nature on Gigigear in UU, as you'll be using all of Gigigear's stats.
Gigigear posseses no way to navigate around Registeel, unless he has already accumulated numerous Charge Beam boosts. Due to this, it's suggested to have a teammate who can take Registeel down. Wish support is also useful for Gigigear, as he may be forced out, and needs his bulk to set up a Gear Change/Charge Beams.
And Game Freak trolled Gigigear, by giving it so many Electric attacks, but not the Electric type!