The Mythical Pokemon Mew can be yours to catch in Pokemon: Let’s Go, Pikachu! and Pokemon: Let’s Go, Eevee!, and no you do not need to go crawling under a truck to get it.
If you purchase a PokeBall Plus accessory, you’ll get a free Mew that you can transfer into the game. Here’s how it works.
To get Mew, you need both an internet connection and a Nintendo Account. Make sure that the PokeBall Plus doesn’t run out of battery during the transfer process.
After you fought and defeated your rival for the first time, head to the menu and select “communicate” and then “mystery gifts.” Then select “get with a PokeBall Plus.” After you connect to the internet, you’ll receive Mew.
Go back to the main menu. Select “party” and then hit the Y button to open the Pokemon Box. From there, you can select Mew and add it to your party. If you want it to follow you around in the over world, you can do so by selecting it and choosing to take it out of its Poke Ball.
Mew starts out at level one and the only move it knows is Pound.
According to the Nintendo Support website, Mew can be only transferred one time into one copy of Pokemon: Let’s Go, Pikachu! and Pokemon: Let’s Go, Eevee!. Once it has been transferred, it will no longer be in the PokeBall Plus.
Caution: If you transfer Mew and then delete your save file, you’ll also delete Mew. You won’t be able to get a new Mew from the same PokeBall Plus.
If you received a message that says “this PokeBall Plus doesn’t contain any Pokemon presents,” the support website recommends looking into the Pokedex to see if Mew has already been transferred. You’ll know if a Mew is still in the PokeBall Plus because it will light up pink or purple and hear Mew’s cry when you hold down the control stick for a few seconds. If you’re unable to transfer the Pokemon, then there may be an issue with your internet connection. If you can verify that Mew wasn’t in the PokeBall Plus when you bought it, contact the retailer where you purchased the accessory.