While the other pseudo-legendaries' pre-evolved forms have seen occasional use in UU thanks to the scarcity of Dragon-types in the tier, Metang is truly an uncommon sight, and it's not too hard to see why. With substandard Attack and Speed stats and poor coverage on its STAB attacks, Metang has virtually no offensive presence. It even lacks Seismic Toss, which most non-threatening Pokemon often rely on for consistent damage. It is also almost entirely outclassed by Registeel, which boasts equal or better stats in every category and a similar movepool.
Metang does have a few perks, however, that save it from being entirely forgettable. Its excellent defensive typing grants it eight resistances, one immunity, and only two weaknesses. Its defensive stats, while not especially impressive, are respectable enough to take advantage of its typing. Most importantly, it has a solid support movepool that includes Reflect, Light Screen, and Trick, all of which Registeel lacks. Make sure to play Metang to these specific strengths, or it will be outclassed.
Metang is the only Steel-type in UU that can set up dual screens (other than Magneton, whose 4x weakness to Ground makes it a poor choice for this role), giving it a unique niche. With numerous resistances and only two weaknesses to Ground- and Fire-type attacks, Metang draws in very different counters compared to Uxie, Claydol, and other popular dual screen users. This makes it an interesting partner for Pokemon such as Charizard and Altaria, both of which can come in virtually for free on Ground- and Fire-type moves and set up with Dragon Dance from behind the screens.
Light Screen and Reflect are obvious on this set, and Metang's decent bulk means it will almost always be able to set both up. Stealth Rock is always a valuable support option for any team, enabling easier KOs for sweepers and punishing opposing switches. However, Meteor Mash is also an option to keep Metang from being set-up bait; the damage output won't knock your socks off, but it is enough to prevent Mismagius from setting up a Substitute in Metang's face. In the final slot, Explosion is an excellent choice to heavily damage any Pokemon that doesn't resist it while guaranteeing your sweeper gets in unmolested.Team Options & Additional Comments >>>
Metang has a nice physical movepool that includes Zen Headbutt, Earthquake, Ice Punch, ThunderPunch, Brick Break, Rock Slide, Bullet Punch, and Pursuit; unfortunately, it lacks both the power and the Speed necessary to be an offensive threat. However, a Choice Band set with Trick and Explosion can potentially cripple two opposing Pokemon per match with good prediction. Gyro Ball is an alternate Steel-type STAB move, but Metang's Speed isn't quite low enough to make it worth using over Meteor Mash. With decent defenses, access to Explosion, and only one weakness in the rain, Metang can be a successful Rain Dance supporter, although Registeel completely outclasses it in this role. Gravity is also an option, but it's rarely worth building a team around, and Metang itself doesn't benefit very much from it. Magnet Rise eliminates Metang's weakness to Ground-type attacks, but the turn it takes to use would usually be better spent setting up screens or Stealth Rock.
Checks and Counters
Rotom is immune to Explosion, resists Meteor Mash, and can use Will-O-Wisp, Thunder Wave, or Pain Split to cripple any sweeper Metang is trying to set up. Steelix's titanic Defense and resistances to Meteor Mash and Explosion mean it's barely dented by Metang's attacks, and it can use Roar to simply phaze away Metang's teammates as they attempt to set up. Magneton resists Metang's attacks and can trap it with Magnet Pull, but it can't stop Metang from putting up its screens and Exploding. In general, Taunt turns Metang into dead weight.