What is a good moveset for Mew?

Question

If you have a good competitive moveset for Mew, post an answer below and upvote the best ones. Movesets for any of its pre-evolutions can also be shared on this thread.

Be sure to include full set details in your post, e.g. items, abilities, natures and EVs. Some detail, including the intended game mode for your set, is also appreciated. Access the full list of guidelines here.

Mew Pokédex and learnset for reference.

Answer 1

Gen 9 NU Nasty Plot

Mew @ Leftovers
Ability: Synchronize
Tera Type: Fairy
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Nasty Plot
- Psychic
- Earth Power
- Draining Kiss

A Nasty Plot set Mew can use in Gen 9 NU. Nasty Plot boosting Mew's Special Attack allows it to become a potent wincon that can easily break down balance teams and be tough for offensive Pokemon to deal with. Psychic is used for the Psychic STAB since is a consistent powerful STAB. (Plus, Chansey is no longer NU now) Earth Power is used to let Mew hit Steel-types such as Magnezone, Registeel, Copperajah, and Klefki super effectively. Earth Power also allows Mew to hit Alolan Muk, Chandelure, and Incineroar super effectively. Draining Kiss lets Mew hit Dark-types such as Krookodile, Brute Bonnet, and Umbreon super effectively, and it allows Mew to have HP recovery. Leftovers gives Mew a little HP recovery each turn. Tera Fairy is used so Mew can resist Dark moves. Tera Fairy is also used to boost Draining Kiss' BP from 50 to 60 so it can deal more damage and heal more HP, making it harder to wear down Mew.

Answer 2

nullification strategy with Mew.
@ Leftovers
Ability: Synchronize
EVs: DEF 128 / SP. DEF 128 / SPE 252
Nature: Serious

Tera type: literally anything
Moveset:
- Imprison
- Transform

In Doubles, all you need to do is bring a mon with trap ability/move (in my case, I'm using Gothitelle with Shadow tag) and use Imprison to prevent your opponent from using any of their moves, immediately use Transform to become your opponent. This way you can prevent opponents from switching out and one of them becomes completely useless.
It's a risky strategy, but when it works it's simply beautiful to see.