Mew @ Black Sludge  
Ability: Synchronize  
Tera Type: Dark  
EVs: 252 Spe  
Jolly Nature  
IVs: 2 HP / 0 SpA / 0 SpD  
- Substitute  
- Imprison  
- Transform  
- Steel Beam / Taunt

Mew @ Black Sludge  
Ability: Synchronize  
Tera Type: Dark  
EVs: 252 Spe  
Jolly Nature  
IVs: 2 HP / 0 SpA / 0 SpD  
- Steel Beam  
- Substitute  
- Encore  
- Baton Pass / Taunt / Imprison / Tailwind / Thunder Wave / Trick Room / Sandstorm / Stealth Rock / Trick

Mew

Mew has an extraordinarily wide movepool, giving it access to great move combinations including being the only Imprison-Transform user and the fastest user of Encore-Steel Beam and Baton Pass-Steel Beam. Mew can reliably Imprison the nearly impervious Gholdengo off Steel Beam, even with an Imprison-Transform set, but it might be better off bluffing Steel Beam and having Taunt instead so switch-ins can no longer Taunt Mew post-Imprison! And if Mew can pull off the Imprison-Transform, the Pokemon in front of it is forced to Struggle, including Magic Bounce users! Do note that Gholdengo and Pokemon behind Substitutes are immune to Transform, though. Thanks to Synchronize, Mew can paralyze anyone who paralyzes it who can still be statused, including Gholdengo and Magic Bounce users! 2 HP IVs make Mew's max. HP divisible by 8 so it can self-2HKO with Black Sludge-Substitute-Steel Beam. Mew must have 3 perfect IVs, so put them in the helpful Speed and lesser-used Attack and Defense. Mew is Jolly so its Steel Beam is as weak as possible, but it still OHKOes Murkrow, Hatenna, Dachsbun, and more. Mew's preferred Tera type is Dark so it can set up close to freely against Pranksters (except Klefki can still use Imprison first).

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