To complete your Pokédex in Pokémon Pokopia, getting Mew is one of the hidden tasks in the game. Mew is not found in normal exploration, so you need to complete a puzzle before it becomes available. You need to collect special items called Mysterious Slates, which are found in a hidden location, and place everything in the correct order. It can take some time as the slate drops are random. In this guide, we will tell you how to get MEW in Pokémon Pokopia.
How To Get MEW

If you want to unlock Mew, all you need to do is collect all 27 Mysterious Slates. These slates drop randomly from the shiny spots you find on the ground. Since the drops are random, there is no fixed location for every slate, so you need to keep breaking shiny spots until you collect all 27.
Once you have every slate, head over to the Wii Wasteland. From the Pokémon Centre, move to the right side until you reach a breakable wall. Break that wall to enter the hidden room inside. In that room, you will find a mural filled with Unown symbols. Each empty slot on the mural matches one of the Mysterious Slates you collected.

Now you need to place each slate in the correct position. You need to rotate each slate before placing it and check the Unown symbol on the back to figure out where it belongs. If you have all 27 slates in your bag at the same time, hold the X button to sort them, and the game will automatically arrange them in the correct order.
After that, place them onto the mural in the same order they appear in your bag. If a slate is placed correctly, it will glow. When you place the final slate, a portal will appear in front of the mural. Interact with that portal, and Mew will be registered in your Pokédex.
