and to Tier 2. Putting these both together, since Deo-A only operates at Tier 2 level with Indeedee-F, and I feel that their combined weight are worthy of Tier 2. Possibly Deo-A to Tier 1. Also the fact that we're actually suspecting Deo-A for being too strong and that's entirely due to it when paired with Indeedee-F makes me wonder why they're only Tier 3 in the first place.
Deo-A under Psychic Terrain is capable of OHKOing much of the metagame with Psycho Boost. With either Tera or Helping Hand, most of the metagame can be OHKOed with Expanding Force, and with both, everything in the metagame that doesn't resist Psychic and doesn't hold Assault Vest (with those holding Assault Vest falling to Psycho Boost):
252 SpA Tera Psychic Deoxys-Attack Helping Hand Expanding Force (120 BP) vs. 252 HP / 4 SpD Raging Bolt in Psychic Terrain: 536-632 (118 - 139.2%) -- guaranteed OHKO
252 SpA Tera Psychic Deoxys-Attack Helping Hand Expanding Force (120 BP) vs. 252 HP / 0+ SpD Diancie in Psychic Terrain: 312-368 (102.6 - 121%) -- guaranteed OHKO
Compounding matters is Deo-A's very high Speed, Focus Sash to take two hits, Indeedee-F being able to Follow Me hits away, and the sheer pressure that Deo-A exerts makes it hard to actually set up hazards against the team in the first place since most of its users fold to Deo-A.
The main reason I think they're Tier 2 and that Deo-A isn't ban worthy is the metagame naturally has checks to Deo-A alongside Indeedee-F that would still be here even if Deo-A gets banned. Incineroar is the biggest check, being able to survive two non-Helping Hand Superpowers without Sitrus thanks to Intimidate Rillaboom can remove Psychic Terrain and tank a non-Helping Hand Psycho Boost. Assault Vest Archaludon may not even be 3HKOed by Tera Psychic Terrain and can tank a Superpower. Tornadus sets up priority Tailwind to shift the momentum against Deo-A and sometimes packs Tera Dark (for priority Taunt immunity). Kingambit forces Superpower which at least limits Deo-A's options. That's 4 out of the 6 Tier 2 Pokemon. In Tier 3, Scarf Chi-Yu outspeeds and Snarls to bypass Follow Me, Chien-Pao can tank one hit with its own Focus Sash and Ice Spinner away Psychic Terrain, Gholdengo can tank a hit unless it's Helping Hand Tera Psycho Boost and also bypass Follow Me, Porygon-2 requires Helping Hand Tera Psycho Boost. Whimiscott has priority Tailwind. Of note lower done, bulky Psychic types (Mew, Cress, Farigaraf) can take any hit set up TR against it or, in the case of Mew, whatever it wants, Tyranitar mandates Superpower and breaks Sash, and Metagross can comfortably switch into anything.
Note that although a lot of these can be overwhelmed with Helping Hand boosts, and Deo-A can Superpower, both have their downsides with them focusing on one Pokemon, which can lead to trades in typical Deo-A fashion. Superpower only having the power to reliably check these Pokemon the first time without an Attack Drop means a wrong Superpower prediction leads Deo-A unable to handle its check, or means it can't handle more than one check. Many teams naturally have at least two checks. I lost count of how many teams I saw on ladder with at least 2 Dark-types, and they can also Tera out of Superpower, with Superpower sometimes being predictable if both opponents resist Psychic. Having to nuke something with Psycho Boost can also remove the offensive pressure that Deo-A exerts. Indeedee, although it can help with Follow Me and Helping Hand, generally doesn't offer enough offense pressure by itself with its attacking moves to deal with most of the checks other than Chien-Pao.
Due to the large number of viable checks available, I don't think it's excessive team building pressure to account for Deo-A Pokemon, in particular with Flutter Mane banned, where the team building for accounting for the two together was excessive. At the same time, since Deo-A requires multiple checks, users can also try to wear down the checks over the battle (or force them to Tera out of their Psychic-type resistance) so that Deo-A can sweep later, especially if hazards are unlikely to be used based on Team Preview.
Edit: with the Deo-A ban, I don’t think Indeedee should move up to 2 unless other Psyspam sweepers such as Deoxys-N and Iron Crown adequately fulfil most of the role that Deo-A held as a Psyspam sweeper.
Deo-A under Psychic Terrain is capable of OHKOing much of the metagame with Psycho Boost. With either Tera or Helping Hand, most of the metagame can be OHKOed with Expanding Force, and with both, everything in the metagame that doesn't resist Psychic and doesn't hold Assault Vest (with those holding Assault Vest falling to Psycho Boost):
252 SpA Tera Psychic Deoxys-Attack Helping Hand Expanding Force (120 BP) vs. 252 HP / 4 SpD Raging Bolt in Psychic Terrain: 536-632 (118 - 139.2%) -- guaranteed OHKO
252 SpA Tera Psychic Deoxys-Attack Helping Hand Expanding Force (120 BP) vs. 252 HP / 0+ SpD Diancie in Psychic Terrain: 312-368 (102.6 - 121%) -- guaranteed OHKO
Compounding matters is Deo-A's very high Speed, Focus Sash to take two hits, Indeedee-F being able to Follow Me hits away, and the sheer pressure that Deo-A exerts makes it hard to actually set up hazards against the team in the first place since most of its users fold to Deo-A.
The main reason I think they're Tier 2 and that Deo-A isn't ban worthy is the metagame naturally has checks to Deo-A alongside Indeedee-F that would still be here even if Deo-A gets banned. Incineroar is the biggest check, being able to survive two non-Helping Hand Superpowers without Sitrus thanks to Intimidate Rillaboom can remove Psychic Terrain and tank a non-Helping Hand Psycho Boost. Assault Vest Archaludon may not even be 3HKOed by Tera Psychic Terrain and can tank a Superpower. Tornadus sets up priority Tailwind to shift the momentum against Deo-A and sometimes packs Tera Dark (for priority Taunt immunity). Kingambit forces Superpower which at least limits Deo-A's options. That's 4 out of the 6 Tier 2 Pokemon. In Tier 3, Scarf Chi-Yu outspeeds and Snarls to bypass Follow Me, Chien-Pao can tank one hit with its own Focus Sash and Ice Spinner away Psychic Terrain, Gholdengo can tank a hit unless it's Helping Hand Tera Psycho Boost and also bypass Follow Me, Porygon-2 requires Helping Hand Tera Psycho Boost. Whimiscott has priority Tailwind. Of note lower done, bulky Psychic types (Mew, Cress, Farigaraf) can take any hit set up TR against it or, in the case of Mew, whatever it wants, Tyranitar mandates Superpower and breaks Sash, and Metagross can comfortably switch into anything.
Note that although a lot of these can be overwhelmed with Helping Hand boosts, and Deo-A can Superpower, both have their downsides with them focusing on one Pokemon, which can lead to trades in typical Deo-A fashion. Superpower only having the power to reliably check these Pokemon the first time without an Attack Drop means a wrong Superpower prediction leads Deo-A unable to handle its check, or means it can't handle more than one check. Many teams naturally have at least two checks. I lost count of how many teams I saw on ladder with at least 2 Dark-types, and they can also Tera out of Superpower, with Superpower sometimes being predictable if both opponents resist Psychic. Having to nuke something with Psycho Boost can also remove the offensive pressure that Deo-A exerts. Indeedee, although it can help with Follow Me and Helping Hand, generally doesn't offer enough offense pressure by itself with its attacking moves to deal with most of the checks other than Chien-Pao.
Due to the large number of viable checks available, I don't think it's excessive team building pressure to account for Deo-A Pokemon, in particular with Flutter Mane banned, where the team building for accounting for the two together was excessive. At the same time, since Deo-A requires multiple checks, users can also try to wear down the checks over the battle (or force them to Tera out of their Psychic-type resistance) so that Deo-A can sweep later, especially if hazards are unlikely to be used based on Team Preview.
Edit: with the Deo-A ban, I don’t think Indeedee should move up to 2 unless other Psyspam sweepers such as Deoxys-N and Iron Crown adequately fulfil most of the role that Deo-A held as a Psyspam sweeper.
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