The truck is located off the dock in Vermillion city just before boarding the SS Anne. You can either trade over a Pokémon who knows surf
-or-
Collect cut from the captain and then faint in a battle, which warps you back to the last
Pokémon Center leaving the SS Anne still in the harbor.
Sadly the truck is merely part of the scenery as would be a tree or shrub. It doesn't do anything. There is no Mew or magical thing of awesomeness. It's just a truck.
1st city
cerelean city
The Pokemon Fan Club is in Vermilion City.
Vermillion City
from Sabrina in saffron city
in saffron city
Fuchsia city.
Vermilion city.
It is in the Pokemon Fan Club in Vermillion City
The cycle road in blue starts from the west celedon city exit to fushia city
Vermillon city You dummy!
Saffron city.