Moves
Leaf Storm blows through neutral targets like Landorus-T, Garchomp, and Gliscor after a boost and smashes bulky Water-types like Rotom-Wash, Slowbro, and Tapu Fini. Hidden Power Fire complements Leaf Storm and threatens Steel-types like Ferrothorn, Mega Scizor, and Skarmory. Glare cripples switch-ins like Tornadus-T, Magearna, Heatran, and Mega Charizard X and allows Serperior to use Substitute to fish for a chance of full paralysis and stall with Leech Seed. Substitute is this set's main attraction, letting Serperior take advantage of forced switches and protecting it from status moves like Toxic from Toxapex and Thunder Wave from Clefable. Finally, Leech Seed enables Serperior to wear down and potentially beat checks such as Heatran, Magearna, and Chansey. Leech Seed also synergizes well with Substitute, as the HP that Serperior gains back lets it use Substitute more frequently.
Set Details
The given HP investment ensures that Rotom-Wash's Hydro Pump and Ferrothorn's Power Whip don't break Serperior's Substitute, while the rest of its EVs are dumped into Special Attack and Speed. Leftovers is necessary for slowly regaining health and to allow Serperior to use Substitute more frequently.
Usage Tips
Serperior fills the role of an early-game wallbreaker and late-game cleaner that can use its solid Speed stat and offensive presence to force switches against Pokemon it scares out, such as Tapu Fini and Rotom-Wash, to make the most out of the free opportunities that Substitute provides. Due to the nature of this set, which involves reducing its own HP, avoid switching Serperior into strong attacks, as this can heavily weaken it. Instead, it is best to bring it in via aggressive switches, with pivot support from Volt Switch and U-turn, or after a teammate has fainted. If the opponent switches in a Pokemon that can take Leaf Storm like Tornadus-T, Kyurem-B, Heatran, or Chansey, Serperior can capitalize on this opportunity to punish these checks with Glare or, in the case of Chansey, wear it down with Leech Seed, making it easier for Serperior's offensive teammates to break through them. Serperior must manage its Leaf Storm PP carefully, as the opponent can play around it with Grass-resistant Pokemon like Magearna and Zapdos and drain Leaf Storm's low PP, eventually leaving it unable to attack. Serperior must be wary of status conditions at all times, especially paralysis and poison, as they will reduce its efficacy. Therefore, it is a good idea to use Substitute to scout for Pokemon that can potentially cripple it with status, such as Thunder Wave from Clefable and Toxic from Toxapex. Serperior must also be wary of Knock Off, as this can reduce both its longevity and the number of times that it can use Substitute. It is often beneficial to use Leech Seed on a predicted switch-in followed by Substitute on the next turn, as opposed to the other way around. This allows Serperior to more efficiently use its PP to force extra damage against slower answers like Heatran, Celesteela, Zapdos, and Volt Switch variants of Magearna.
Team Options
This Serperior set is a solid fit on teams ranging from offense, bulky offense, balance, sand, and sun, which value its capability as a wallbreaker and late-game cleaner. Pivots such as Tornadus-T, Landorus-T, and Tapu Koko are solid partners, as they can safely bring Serperior in via U-turn and Volt Switch. Additionally, they can remove entry hazards with Defog, especially Toxic Spikes from Toxapex, which ruins Serperior's longevity. Tapu Koko also has the benefit of taking on Flying-types like Tornadus-T and Hawlucha. Heatran sets up Stealth Rock and provides a solid answer to Steel-types that threaten Serperior like Celesteela and Magearna. Protean and Battle Bond Greninja are also solid partners, as they can provide crucial support with Spikes. Protean variants can also snipe Magearna with Tectonic Rage, which is especially helpful for variants that don't have Leech Seed, while the Battle Bond variant eliminates Heatran and places heavy pressure on Assault Vest Magearna in conjunction with Spikes. Bulky Water-types like Tapu Fini and Toxapex are also beneficial, checking Fire-types like Volcarona, Victini, and Heatran. Tapu Fini can also summon Misty Terrain to protect Serperior from status conditions and remove hazards with Defog, while Toxapex lays down Toxic Spikes to put pressure on the likes of Chansey, Tapu Koko, and Kyurem-B, and Shed Shell variants of Toxapex can switch into Heatran's Magma Storm and remove its Leftovers with Knock Off. Magnezone can remove a lot of pressure for it by trapping and eliminating Steel-types like Mega Scizor, Ferrothorn, and Skarmory, giving it more freedom to drop Hidden Power Fire. Magearna is also a fantastic partner, as it can bring Serperior in safely via Volt Switch and solidly answers the likes of Weavile, Tornadus-T, and Mega Latias. Strong wallbreakers like Mega Medicham, Mega Mawile, and Tapu Lele soften checks like Magearna for Serperior to clean up later in the game and appreciate the paralysis support from Glare, letting them threaten faster checks like Tornadus-T. Serperior also appreciates Weavile punishing switch-ins with Knock Off, weakening the likes of Chansey, trapping and removing Tornadus-T and Mega Latias with Pursuit, and revenge killing Dragon-types like Kommo-o and Dragonite. Serperior forms a splendid partnership with Mega Diancie, as Serperior checks bulky Water-types like Gastrodon, and in return, Mega Diancie handles Fire- and Flying-types like Volcarona, Mega Charizard Y, Zapdos, and Tornadus-T and blocks hazards thanks to Magic Bounce. On sand teams, Mega Tyranitar and Sand Rush Excadrill greatly appreciate Serperior handling bulky Water-types like Rotom-Wash, Seismitoad, and Tapu Fini, as well as the paralysis support that Serperior's Glare provides. In return, Mega Tyranitar solidly answers the likes of Heatran and Tornadus-T, and it can potentially eliminate the latter with Pursuit, while Excadrill is grateful for Serperior pressuring Ground- and Water-type checks like Landorus-T and Mega Swampert. Swords Dance variants of Mega Garchomp also benefit from the paralysis support that Serperior’s Glare provides, crippling faster targets like Mega Latias and Tornadus-T and potentially granting Mega Garchomp extra setup opportunities due to the chance of full paralysis. On sun teams, Fire-type teammates like Mega Charizard Y and Victini greatly benefit from Serperior removing Mega Diancie, and in return, they threaten Steel-types like Mega Scizor, Ferrothorn, and Celesteela. The sun provided by Mega Charizard Y also grants Serperior's Hidden Power Fire an extra power boost and allows Serperior to have a higher chance of 2HKOing Celesteela and defensive Magearna with a boosted Hidden Power Fire. Additionally, both Fire-types benefit from the paralysis from Serperior's Glare crippling targets like Toxapex and Mega Latias, and the chance of full paralysis prevents them from healing, allowing these Fire-types to break through these targets more easily.