(Threats & Issues // Fixes):
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This team is exceptionally weak to SubSeed Serperior. While Muk-A is a fine switch-in to Leaf Storm, it actually get's stalled out by the combination of Leech Seed + Subsitute with little effort, meaning a simple Subsitute prediction on the switch to Muk-A will make it incredibly difficult for the team to deal with Serperior. Aggron can switch into Leaf Storm when already evolved into its Mega form but lacks recovery and is simultaneously pressured by many other threats, while also failing to OHKO Serperior with Heavy Slam. An even more troublesome is the lack of speed control, making it impossible to revenge kill the grass snake. A more appropriate switch-in and countermeasure is Crobat, which I recommend in place of Mantine. The set provided in the import is able to OHKO Serperior (through the Substitute, thanks to Infiltrator) and outspeeds everything up to Adamant Mega Beedrill/Modest Mega Sceptile. It carries Defog to make up for the loss of Mantine as a Defogger and also sports Taunt, which is used in conjunction with Defog to completely deny hazards and stop the omnipresent Gliscor from boosting with Swords Dance. Other options like Toxic, which can help defeat VinCune (again, thanks to Infiltrator ignoring the Subsitute) since Leaf Storm PP are heavily pressured, and Haze, to help versus Dragon Dance Mega Altaria and Double Dance Cobalion, are equally viable options in that slot.
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Mega Manectric is yet another annoyingly effective tool versus this team: The Ground type, Gliscor, fails to properly check it because of the x4 weakness to HP Ice, and there is not a single option to outspeed and revenge kill Manectric-M. Therefore, I would like to suggest opting for Recover>Psyshock on Latias. This change helps to alleviate the pressure Mega Manectric poses by increasing Latias' longevity. Thunderbolt is chosen over Psyshock here, because the removal of Sap Sipper Azumarill is of paramount importance for Serperior. On the subject of Latias, 56 attack EVs on Latias ensure the OHKO on standard Muk-A with Tectonic Rage after a Draco Meteor (coming from 200 special attack EVs)!
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Another change that I am inclined to make and that will also help with the aforementioned issue of Mega Manectric, is to opt for Choice Scarf Krookodile over AV Muk-A. With Crobat completely shutting down Serperior, and Mega Aggron being a solid switch-in to Latias, this change helps to improve the teams match-up versus the likes of Cobalion, Mega Aerodactyl and Mega Pidgeot being able to remove them with Earthquake or Stone Edge respectively (or damage the latter two with Pursuit on the switch!). The EV spread outspeeds +1 Adamant Mega Sharpedo while taking an unboosted Draco Meteor from Latias after 1 round of Spikes or two rounds of Stealth Rock damage (the loss in attack power is negligible).
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With Choice Scarf Krookodile and Crobat having patched up the team's deficit in speed, the fourth movesloton on Aggron, previously occupied by Thunder Wave, is a lot more flexible now. I recommend giving it Taunt to prevent Stealth Rock from the likes of Hippowdown and Swampert, as well as to stop recovery in order to pressure defensive cores better, since solely relying on Serperior versus stall might prove to be difficult considering people have started adapting to it. Also, since SD Scizor becomes more troublesome with the replacement of Mantine, Fire Punch over Earthquake helps checking it. The new EV distribution on Mega Aggron ensures the KO on Belly Drum Azumarill with Heavy Slam after Sitrus Berry recovery and one round of Stealth Rock, while also outspeeding Blissey with 4 speed EVs. (Alternatively, Avalanche can be used over Taunt if SD Gliscor turns out to be too huge of a threat.)
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The last change I'm going to mention is optional. As of now the team has trouble switchting into Hydreigon (as result of the Mantine replacement) and it lacks a way to immediately apply pressure outside of Serperior. Choice Band Azumarill can grant the team a switch-in to Dragon and Dark type attacks, removing pressure from Mega Aggron, and is able to put a dent in Serperior checks like Mandibuzz, Moltres and opposing Mega Aggron with Huge Power boosted attacks. Additionally, a decently strong priority attack in the form of Aqua Jet helps versus opposing SD Gliscor and can remove other, speedy Serperior checks such as Mega Aerodactyl and Mega Beedrill. Instead of commiting to this change however, Gliscor can also opt for a more specially defensive spread of 244 HP / 8 Atk / 200 SpD / 56 Spe with a Jolly nature, which takes 2 consecutive Draco Meteor after Rocks and Poison Heal recovery (with Recover on Latias it is now an option to neglect Entei and Nidoking in terms of speed on Gliscor). The user of this team should be aware however, that SD Facade Gliscor is not able to apply as much immediate pressure as Choice Band Azumarill but instead possesses better sustainability.
Overview of the changes I made:
- Recover>Psyshock and a slightly altered EV spread on Latias
- Replaced Mantine with Defog Crobat
- Replaced Assault Vest Muk-A with Choice Scarf Krookodile
- Taunt>Thunder Wave, Fire Punch>Earthquake and an edited EV spread on Mega Aggron
- Option A) Replace Gliscor with Choice Band Azumarill
OR Option B) Opt for more special defense on Gliscor
Concluding, the team has a comprehensible game plan incorporated (remove Serperior checks, then sweep), which I payed attention to keep intact. The changes I made this time around (in comparison to last round) were much more impactful on the teams overall structure and appearance but I feel it this is necessary in order to keep up with recent developments in the tier. Personally, I prefer the change from Gliscor to Azumarill but from testing I can report that both options have worked out. Peace!