If you're around the same age as me or a little older, you may have fond memories of going out to recess and talking with your classmates about Pokémon Red and Blue – which Pokémon you caught, what Gym Leaders you had beaten, and what "secrets" you had found. There was the Missingno glitch that could give you infinite items, and the messed up high-level Pokémon catchable off Cinnabar Island. But there was also a rumor everyone spread despite it never being true: that Mew could be found under a truck just outside the S.S. Anne.
Now, 30 years later, Pokopia players are making this legend true…sort of.
Mew is obtainable in Pokémon Pokopiathrough a lengthy item hunt that you'll probably be working on for a good chunk of the game, but that doesn't have anything to do with trucks or the S.S. Anne. However, a number of players are heading out to Bleak Beach, where a crumbled wreck of the S.S. Anne is docked, and building a truck just offshore. Then, they're having Mew follow them out to the zone and assigning Mew the truck area as a habitat, effectively closing the loop on the legend.