I was quite inspired by
GOSCIZOR's
Dome Doubles team and have been wanting to experiment with something similar for ages. The tactic of combining Explosion with a Ghost-type is a fun one: Metagross and Sableye make a fantastically effective duo that can basically guarantee a successful use of Explosion 90% of the time thanks to Sableye's access to Fake Out and Metagross's decent Speed.
Of course, you could simply repeat that formula for your backup slots - using some combination of Wailord, Shiftry, Regirock, Regice, Electrode, Muk, Glalie, Golem, Camerupt, Cloyster, Nosepass, Lunatone, Solrock, Steelix, Torkoal, Weezing, Forretress, Sudowoodo, Claydol, Snorlax, and/or Gengar and having them both blow up while Sableye points and laughs at your opponent. But that's gimmicky and kind of uninspired; I felt like being a bit more creative. So as the two as leads were more or less nailed-on, I contemplated who else I could use to back them up.
Building the Team]
150917 @ Salac Berry (Clear Body)
Hidden Power Steel
Shadow Ball
Brick Break
Explosion
252 Attack/Speed, 6 Sp.Def (
Adamant)
The obvious lead. I actually briefly considered using Electrode (the in-game trade Electrode from FRLG has a beneficial nature, serviceable IVs, and an Ice-type Hidden Power) purely for the fact that its immense Speed practically guarantees getting off an Explosion in most cases. But it's far weaker and can't really do much else outside of blowing up - not to mention, it's vulnerable to a range of things Metagross deals with better. It's worth testing, but probably has much more overall utility on a weather team.
I've been talked round on Hidden Power Steel vs Meteor Mash. HP Steel falls short of KOs on certain foes, but Metagross is generally faster and Fake Out allows the 2HKO without much cost if the second foe isn't threatening. Shadow Ball is - obviously - there for Ghosts, while Brick Break takes care of things like Aggron, Regirock, and Registeel who make Explosion undesirable. Otherwise its job is to explode as soon as possible, and take as many enemies down with it as possible.
Salac Berry is there to give it a second wind and to get the jump on faster things, but it could definitely find a better item. Liechi is probably a better option overall. It lets Explosion OHKO Skarmory for certain and nudges both Steelix and Registeel into being possible KOs. But of those only Registeel is a truly troubling foe so I'm torn.
The unrealistic-but-ideal scenario is that Metagross can safely KO both leads without having to sacrifice itself and then explode on the two backups (it has happened, but rarely). The most realistic "easy win" is that Metagross can pick off
one of the two leads and then explode the next turn leaving the state of play 3v1. A win is all but guaranteed in this case.
Yamil @ Leftovers (Keen Eye)
Fake Out
Toxic
Protect
Recover
248 HP, 20 Defence, 240 SpDef (
Bold)
The other obvious lead. Fake Out allows you to block a potentially troublesome foe and give Metagross freedom to blow up (or potentially facilitate a switch, though that's rarely an optimal tactic). I considered Night Shade over Toxic but the latter is more reliable against passive foes and is basically an insta-win against weaker opponents if the battle comes down to just Sableye alone, which happens with some frequency. It works delightfully in conjunction with Gen III's switching mechanics when both the opposing leads are slower than Metagross and don't need to be flinched: Metagross explodes, both foes faint, and Sableye uses Toxic straight away on one of the incoming mons.
Even though Ghost-types are unaffected by Explosion, Protect is crucial to Sableye's longevity as opponents tend to prefer targeting it with status moves and can be baited with great predictability when its HP gets low. It's also proven critical in longer fights as a lot of powerful moves will still 2HKO Sableye, so allowing for that extra turn of Leftovers recovery can allow it to survive the next hit and use Recover. All of its moves have their PP maxed to give it as much staying power as possible in protracted stall battles and ensure that the opponent Struggles first. I wish it had room for Rest, or could even carry a Lum Berry, as being poisoned can prove hard to deal with, but this hasn't (yet) cost me a match. I even considered the merits of Calm Mind+Faint Attack, since nothing is immune to Dark and it ignores evasion boosts, but quickly dismissed this as impractical.
For my backup slots, I got to thinking about what could work to quickly and efficiently end battles, as well as what Metagross doesn't like dealing with. Fast Earthquake users are unpleasant, as are Ghosts and generally bulky physical mons - a fast special attacker can cover a lot of that, but many fast special attackers are frail and easily picked off.
Thinking this over, though, I rationalised that something on the frailer side might actually work well in conjunction with Sableye, especially if attackers are motivated to go for its partner first and allow it time to poison them. Having never used Destiny Bond on a serious team before (as far as I can remember) Gardevoir struck me as a fun option, since it can KO a lot of stuff and has a reliable way to take out opponents it can't beat.
Shaye @ Lum Berry (Synchronise)
Psychic
Thunderbolt
Ice Punch
Destiny Bond
252 SA/Speed, 6 HP (
Timid)
Gardevoir: very straightforward in how it plays. The old SynchoLum strategy is as good as ever; Ice Punch and Thunderbolt cover a multitude of sins, while Psychic is your bread-and-butter coverage against most foes. It'd be good if Destiny Bond had slightly more PP, but foes that can KO you generally don't wait for very long to do that so I've never found myself running out.
It does what it does incredibly well, but I'd hardly call it flawless. Even with Timid, it really needs to be just a touch faster. Alakazam outclasses it in both speed and power - I just wish the latter learned Destiny Bond. To be honest even without that I'm debating making the switch: Alakazam can run all three elemental punches, OHKOs Scizor in all instances, and outruns way more stuff even with a Modest nature.
Although Gardevoir's moves hit a lot of things Metagross doesn't like, there's still a huge amount of stuff that troubles it that Gardevoir can't always efficiently deal with: namely Fire, Ground, Rock, and Steel opponents. One Pokemon came to mind as a counter to all of those types, and one I'd also been interested in trying out since others have used it on teams in this thread.
Macron @ Shell Bell (Water Absorb)
Hydro Pump
Brick Break
Ice Beam
Haze
252 Attack, 236 Sp.Atk, 16 Defence, 6 Speed
(Brave)
Poliwrath was a mon I'd wanted to experiment with for a while after using one in my very first playthrough of SoulSilver many years back. It's not as good as it is post-physical/special split, but it's certainly a fun and unconventional option.
I'd normally be inclined to avoid Hydro Pump because of the low accuracy, but Poliwrath's underwhelming Special Attack kind of forces it - thankfully, I've not had too many misses. Even with a Brave nature, the extra point in Speed allows it to outrun all Tyranitar variants, the majority of which can be cleanly OHKO'd with Brick Break.
Some might question why Poliwrath specifically, given that it's hardly a top-tier mon. True enough, there's any number of Water or Fighting types I could have used as a backup. Poliwrath, however, has one chief advantage - it learns Haze.
Why does this matter? Because this team badly needs an answer to Double Teamers, especially those who pop up AFTER Metagross has fainted. After getting conclusively outplayed by Snorlax1 22 battles in (Sableye was stalemated - unable to be Attracted, unable to poison it due to Immunity, and both their Struggles would be too weak to outdamage the recovery from Leftovers) I realised that Haze would have allowed Poliwrath (waiting listlessly in the back, with no hope of landing a hit with Brick Break thanks to Snorlax's evasion boosts) to snatch the win. Gardevoir would have been able to Destiny Bond even despite the evasion boosts but, being female, fell prey to Attract. Adding Haze to its movepool allowed me to deal with those problematic foes: on two occasions I've outlasted Gardevoir2 by switching back and forth between Sableye and Poliwrath to bait it into using up all its Psychic PP so I could safely use Haze and eventually bring it down.
I feel like it could be better, though. The item choice was more out of a lack of options than anything else (rejected: Brightpowder, Quick Claw, Sitrus Berry, Starf Berry) but works well enough: Poliwrath's good typing and decent natural bulk means that it can shrug off a lot of hits, and the small HP recovery allows it to last slightly longer and hopefully win wars of attrition. Meanwhile Ice Beam is rarely used but very occasionally comes in handy, though most of the things it's good against have ways to kill you anyway. Flygon for instance is only a guaranteed KO if Poliwrath has over 60% HP as it will outspeed and do ~50% with Earthquake. You're not even guaranteed a KO on Salamence, miserably. I did initially consider Icy Wind, but the Speed drop doesn't do a lot for the rest of the team: Sableye is too slow for a -1 drop to consistently help, and Gardevoir outspeeds a lot of stuff already.
All of this is moot, though, as Poliwrath rarely actually puts in an appearance due to Sableye's incredible staying power. Between them Metagross, Gardevoir, and Sableye are generally capable of taking out four foes, so it's rare for Poliwrath to actively participate in more than one or two battles out of seven. But I'd like to improve it if I can.