I bet some people have heard this one before. Even if so, read on...
According to the myth, if you went to the truck near the S.S. Anne and used strength on it, the truck would move and a pokeball containing a mew would appear where it was.
Why doesn't it work?Edit
The truck is just an easter egg. and no, the keys at the Game corner wont open it. No matter how many times you use strength, the truck won't budge, or flip, or any other thing you decide it may do. Also, you cannot slash the tires using cut, even though that wouldnt do anything to move it.
The information was from a youtube video involving the truck (the link to it is in the extenal links section). This article was written by The weasel.
A video involving the myth.