Approved by The Immortal and drampa's grandpa
In Nature Swap, Pokemon's Nature will swap its affected base stats around, this allows some Pokemon to approach differently than usual depending on their nature. For example, A Gentle nature Corviknight will have 105 Sp. Defense and 85 Defense, and Hasty Nature will make it have 105 Speed and 67 Defense. Furthermore, Nature no longer reduces its stat by 10% in Nature Swap.
Banlist:
Clauses: Species Clause, Sleep Clause, Evasion Clause, OHKO Clause, Endless Battle Clause, Dyanamx Clause
Pokemon: Blissey, Calyrex-Ice, Calyrex-Shadow, Chansey, Cloyster, Dialga, Eternatus, Genesect, Giratina, Giratina-Origin, Groudon, Ho-Oh, Kyogre, Kyurem-Black, Kyurem-White, Landorus-Incarnate, Lugia, Lunala, Marshadow, Melmetal, Mewtwo, Naganadel, Necrozma-DM, Necrozma-DW, Palkia, Rayquaza, Reshiram, Solgaleo, Xerneas, Yveltal, Zacian, Zacian-Crowned, Zamazenta, Zamazenta-Crowned, Zekrom, Zygarde
Ability: Power Construct, Arena Trap, Shadow Tag, Moody
Moves: Baton Pass

With an Impish Nature, they become incredibly difficult to KO. Blissey was previously banned in Generation 7 after it has proven to be a terrifying wall, so I follow suit without any chance of seeing it in practice. Blissey also takes advantage of Heavy-Duty Boots well.

Do you like getting flinched by Double Iron Bash? No? That's why Melmetal's banned since it will be doing just that with a Hasty Nature while being reasonably bulky for something very fast with its plenty of resistances.

Cloyster will be a horrifying sweeper with a Lonely Nature once it pulls off a Shell Smash. Generation 8 also introduced Heavy-Duty Boots, meaning that it doesn't have to worry about entry hazards as much as before. Therefore Cloyster is banned before testing any water because it's just not worth the risk.
I don't think I need to explain why Pokemon in Ubers are banned. The same goes for abilities.
Threatlist:
Magearna, already an outstanding Pokemon with its fantastic type combination with excellent coverage and versatility, benefited greatly from Nature Swap with Timid Nature granting it a better speed stat, Hasty or Naive could work but Timid doesn't take any of it bulk away and can boost its speed further with Shift Gear. Magearna also gets Trick, Stored Power, and Draining Kiss in Gen 8, making checking Magearna more difficult than before.
On the one hand, Regieleki can wreak havoc with a Jolly Nature coming off from a whooping 200 Special Attack on top of having Transistator to boosts its firepower further. On the other hand, it's no longer as fast as before and Regieleki's coverage is still underwhelming that it remains an easy prey for Ground-types. So that really depends.
In Nature Swap, Pokemon's Nature will swap its affected base stats around, this allows some Pokemon to approach differently than usual depending on their nature. For example, A Gentle nature Corviknight will have 105 Sp. Defense and 85 Defense, and Hasty Nature will make it have 105 Speed and 67 Defense. Furthermore, Nature no longer reduces its stat by 10% in Nature Swap.
Banlist:
Clauses: Species Clause, Sleep Clause, Evasion Clause, OHKO Clause, Endless Battle Clause, Dyanamx Clause
Pokemon: Blissey, Calyrex-Ice, Calyrex-Shadow, Chansey, Cloyster, Dialga, Eternatus, Genesect, Giratina, Giratina-Origin, Groudon, Ho-Oh, Kyogre, Kyurem-Black, Kyurem-White, Landorus-Incarnate, Lugia, Lunala, Marshadow, Melmetal, Mewtwo, Naganadel, Necrozma-DM, Necrozma-DW, Palkia, Rayquaza, Reshiram, Solgaleo, Xerneas, Yveltal, Zacian, Zacian-Crowned, Zamazenta, Zamazenta-Crowned, Zekrom, Zygarde
Ability: Power Construct, Arena Trap, Shadow Tag, Moody
Moves: Baton Pass


With an Impish Nature, they become incredibly difficult to KO. Blissey was previously banned in Generation 7 after it has proven to be a terrifying wall, so I follow suit without any chance of seeing it in practice. Blissey also takes advantage of Heavy-Duty Boots well.

Do you like getting flinched by Double Iron Bash? No? That's why Melmetal's banned since it will be doing just that with a Hasty Nature while being reasonably bulky for something very fast with its plenty of resistances.

Cloyster will be a horrifying sweeper with a Lonely Nature once it pulls off a Shell Smash. Generation 8 also introduced Heavy-Duty Boots, meaning that it doesn't have to worry about entry hazards as much as before. Therefore Cloyster is banned before testing any water because it's just not worth the risk.
I don't think I need to explain why Pokemon in Ubers are banned. The same goes for abilities.
Threatlist:


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