I think I found a really powerful Battle Tower team. I've done a little bit of testing, and here's what I came up with.
Linoone @ Choice Band (M)
Ability: Pickup
EVs: 252 HP / 36 Def / 220 Spe
IVs: 31/0/31/31/31/31
Nature: Timid
-Trick
-Thunder Wave
-Charm
-Sand-attack
220 EVs in speed + a Timid nature allow Linoone to hit 320 speed, which outspeeds all but one type of Gengar and all Espeon. I put the remaining 252 EVs in HP for better overall bulk and the remaining 36 EVs in Def to somewhat mitigate any choiced physical assaults Linoone takes. The EV spread can probably be better optimized, but this Linoone is amazing at its job overall. Also I want to mention that unlike in the Gen 4 games, choice locking the AI on a Fight-type move, and then switching in a Ghost-type doesn't cause the AI to switch Pokemon the following turn. I tried this in the earlier rounds where I replaced Latias with a Misdreavus. It might be possible that the AI changes their behavior later, but I don't think they do. Linoone has the best movepool out of any Trick user because he is the only user of Trick that has access to Thunder Wave + an attack lowering move + an accuracy lowering move.
Latias @ Lum Berry (F)
Ability: Levitate
EVs: 80 HP / 252 Def / 176 Spe
IVs: 31/0/31/31/31/31
Nature: Timid
-Calm Mind
-Substitute
-Recover
-Dragon Claw
176 EVs in speed + a Timid nature allow Latias to hit 330 speed, which outspeeds all Raikou by 1 point. The remaining EVs were done to maximize Latias's physical bulk since it will likely be at +6 SpD anyway. It looks a little bit odd, but this technically offers better physical bulk than 252 HP / 80 Def. Dragon Claw is awesome since its STAB and only Shedinja (there is only 1 other than Greta's in the entire frontier) is immune to it. I tried Rest + Chesto first, but I find using Lum Berry + Recover to be better. Timid nature must be used since neutral nature Latias hits only 319 speed with 252 EVs in speed.
Registeel @ Leftovers
Ability: Clear Body
EVs: 252 HP / 156 Def / 100 SpD
IVs: 31/31/31/31/30/31
Nature: Careful
-Curse
-Amnesia
-Rest / Substitute
-Hidden Power Steel
The IVs used let Registeel have the best overall defenses and physical attack while also having Hidden Power Steel. This EV spread gives Registeel its optimal overall bulk. Hidden Power Steel is a good STAB move since only Shedinja is immune to it. Registeel is used since it is resistant to Bug, Ghost, Dark, Dragon, and Ice, which Latias is weak to. Latias resists Fighting and Fire and is immune to Ground, all of which Registeel is weak to. Since Registeel has such well-balanced bulk and access to Curse and Amnesia, I figured that he was the best overall choice. Substitute honestly might be better than Rest to deal with critical hit bullshit, but more testing would be needed. The EV spread could also be adjusted.
Overall though, this team is pretty sick if you want a long streak.
Edit: Latias is awesome. It only struggles with two Pokemon that I've encountered in the frontier: Blissey and Metagross. Even at +6 attack, Registeel kinda fails to sweep. Many of the Blissey run counter, and Registeel only does ~60% with a Hidden Power Steel at +6. You'd have to run a crazy amount of EVs for Registeel to have a shot at the OHKO. Registeel also makes the team weak against Houndoom if the setup doesn't work properly. To combat this, I'm going to try replacing Registeel with the following set:
Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP / 104 Def / 152 SpD
Nature: Careful
-Earthquake
-Toxic
-Substitute
-Protect
This Swampert is able to deal every Blissey and every Metagross. Every Blissey runs Bold nature with 255 Def / 255 SpD, so Blissey is weak and sits at 146 speed. With no EVs in speed, Swampert sits at 156 speed. With 252 HP EVs and 152 SpD EVs, Swampert is never 2HKO'd by a +6 Ice Beam from Blissey, which is the second most damaging attack that she can use to Swampert. Blizzard, which is the most powerful move Blissey can use against Swampert, can be stalled out with a combination of Substitute + Protect. The idea is that Swampert can Toxic stall all the Blissey out since none of them run Rest. In addition the 252 HP EVs let Swampert sit at 404 HP, so the one Blissey that runs Seismic Toss cannot break Swampert's substitutes in one turn. The remaining EVs were put into defense. Swampert can tank any hit that Metagross throws at it. Even with 0 EVs in attack and no attack-boosting nature, Swampert is still able to always 2HKO 170 HP / 0 Def Metagross with a neutral nature (i.e. the most physically bulky Metagross in the frontier) with Earthquake.
Edit 2: Substitute on Registeel is waaaay better than Rest. Changing Rest to Substitute makes Registeel go from being pretty mediocre to being pretty fearsome. However with the fully defensive spread, Registeel struggles against Rest Metagross (which is 170 HP / 0 Def). I'm going to test a Registeel with the following EV spread:
Registeel @ Leftovers
Ability: Clear Body
EVs: 252 HP / 156 Atk / 52 Def / 48 SpD
IVs: 31/31/31/31/30/31
Nature: Impish
-Curse
-Amnesia
-Substitute
-Hidden Power Steel
With this EV spread, Registeel hits 225 attack which allows Registeel to always 3HKO Rest Metagross with Hidden Power Steel. Otherwise this Metagross can start spamming Double Team and royally screw you over. With 252 HP and 52 Def, Registeel at +6 only takes a maximum of 12% from this Metagross's Earthquake. Assuming no critical hits, it takes this Metagross 3 Earthquakes to break Registeel's substitute. Metagross is by far and away the most threatening Pokemon to this Registeel.
Comparison of EV spreads for Registeel. The first 3 EV spreads aim to give Registeel enough attack to always 3HKO Rest Metagross while providing the most overall bulk. I was just comparing spreads to see if I was losing points anywhere. An Impish nature is required for Registeel to both always 3HKO Rest Metagross and have its substitutes 3HKO'd.
Here's a video showing the AI doesn't switch even in the later rounds.
Also Grumpig might be worth trying over Linoone with a set of Trick, Torment, Protect, Light Screen / Reflect / Filler
Linoone @ Choice Band (M)
Ability: Pickup
EVs: 252 HP / 36 Def / 220 Spe
IVs: 31/0/31/31/31/31
Nature: Timid
-Trick
-Thunder Wave
-Charm
-Sand-attack
220 EVs in speed + a Timid nature allow Linoone to hit 320 speed, which outspeeds all but one type of Gengar and all Espeon. I put the remaining 252 EVs in HP for better overall bulk and the remaining 36 EVs in Def to somewhat mitigate any choiced physical assaults Linoone takes. The EV spread can probably be better optimized, but this Linoone is amazing at its job overall. Also I want to mention that unlike in the Gen 4 games, choice locking the AI on a Fight-type move, and then switching in a Ghost-type doesn't cause the AI to switch Pokemon the following turn. I tried this in the earlier rounds where I replaced Latias with a Misdreavus. It might be possible that the AI changes their behavior later, but I don't think they do. Linoone has the best movepool out of any Trick user because he is the only user of Trick that has access to Thunder Wave + an attack lowering move + an accuracy lowering move.
Latias @ Lum Berry (F)
Ability: Levitate
EVs: 80 HP / 252 Def / 176 Spe
IVs: 31/0/31/31/31/31
Nature: Timid
-Calm Mind
-Substitute
-Recover
-Dragon Claw
176 EVs in speed + a Timid nature allow Latias to hit 330 speed, which outspeeds all Raikou by 1 point. The remaining EVs were done to maximize Latias's physical bulk since it will likely be at +6 SpD anyway. It looks a little bit odd, but this technically offers better physical bulk than 252 HP / 80 Def. Dragon Claw is awesome since its STAB and only Shedinja (there is only 1 other than Greta's in the entire frontier) is immune to it. I tried Rest + Chesto first, but I find using Lum Berry + Recover to be better. Timid nature must be used since neutral nature Latias hits only 319 speed with 252 EVs in speed.
Registeel @ Leftovers
Ability: Clear Body
EVs: 252 HP / 156 Def / 100 SpD
IVs: 31/31/31/31/30/31
Nature: Careful
-Curse
-Amnesia
-Rest / Substitute
-Hidden Power Steel
The IVs used let Registeel have the best overall defenses and physical attack while also having Hidden Power Steel. This EV spread gives Registeel its optimal overall bulk. Hidden Power Steel is a good STAB move since only Shedinja is immune to it. Registeel is used since it is resistant to Bug, Ghost, Dark, Dragon, and Ice, which Latias is weak to. Latias resists Fighting and Fire and is immune to Ground, all of which Registeel is weak to. Since Registeel has such well-balanced bulk and access to Curse and Amnesia, I figured that he was the best overall choice. Substitute honestly might be better than Rest to deal with critical hit bullshit, but more testing would be needed. The EV spread could also be adjusted.
Overall though, this team is pretty sick if you want a long streak.
Edit: Latias is awesome. It only struggles with two Pokemon that I've encountered in the frontier: Blissey and Metagross. Even at +6 attack, Registeel kinda fails to sweep. Many of the Blissey run counter, and Registeel only does ~60% with a Hidden Power Steel at +6. You'd have to run a crazy amount of EVs for Registeel to have a shot at the OHKO. Registeel also makes the team weak against Houndoom if the setup doesn't work properly. To combat this, I'm going to try replacing Registeel with the following set:
Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP / 104 Def / 152 SpD
Nature: Careful
-Earthquake
-Toxic
-Substitute
-Protect
This Swampert is able to deal every Blissey and every Metagross. Every Blissey runs Bold nature with 255 Def / 255 SpD, so Blissey is weak and sits at 146 speed. With no EVs in speed, Swampert sits at 156 speed. With 252 HP EVs and 152 SpD EVs, Swampert is never 2HKO'd by a +6 Ice Beam from Blissey, which is the second most damaging attack that she can use to Swampert. Blizzard, which is the most powerful move Blissey can use against Swampert, can be stalled out with a combination of Substitute + Protect. The idea is that Swampert can Toxic stall all the Blissey out since none of them run Rest. In addition the 252 HP EVs let Swampert sit at 404 HP, so the one Blissey that runs Seismic Toss cannot break Swampert's substitutes in one turn. The remaining EVs were put into defense. Swampert can tank any hit that Metagross throws at it. Even with 0 EVs in attack and no attack-boosting nature, Swampert is still able to always 2HKO 170 HP / 0 Def Metagross with a neutral nature (i.e. the most physically bulky Metagross in the frontier) with Earthquake.
Edit 2: Substitute on Registeel is waaaay better than Rest. Changing Rest to Substitute makes Registeel go from being pretty mediocre to being pretty fearsome. However with the fully defensive spread, Registeel struggles against Rest Metagross (which is 170 HP / 0 Def). I'm going to test a Registeel with the following EV spread:
Registeel @ Leftovers
Ability: Clear Body
EVs: 252 HP / 156 Atk / 52 Def / 48 SpD
IVs: 31/31/31/31/30/31
Nature: Impish
-Curse
-Amnesia
-Substitute
-Hidden Power Steel
With this EV spread, Registeel hits 225 attack which allows Registeel to always 3HKO Rest Metagross with Hidden Power Steel. Otherwise this Metagross can start spamming Double Team and royally screw you over. With 252 HP and 52 Def, Registeel at +6 only takes a maximum of 12% from this Metagross's Earthquake. Assuming no critical hits, it takes this Metagross 3 Earthquakes to break Registeel's substitute. Metagross is by far and away the most threatening Pokemon to this Registeel.
Comparison of EV spreads for Registeel. The first 3 EV spreads aim to give Registeel enough attack to always 3HKO Rest Metagross while providing the most overall bulk. I was just comparing spreads to see if I was losing points anywhere. An Impish nature is required for Registeel to both always 3HKO Rest Metagross and have its substitutes 3HKO'd.
Here's a video showing the AI doesn't switch even in the later rounds.
Also Grumpig might be worth trying over Linoone with a set of Trick, Torment, Protect, Light Screen / Reflect / Filler
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