Anyways Glitch City is a term used by players of the Pokemon games to refer to corrupted maps that result from a glitch present in Pokemon Red/Blue/Yellow. Glitch Cities in Pokemon Yellow are different from those in Pokemon Red and Blue. To access Glitch City, the player must enter a Safari Game, then immediately after entering, attempt to leave. The attendant will ask if the player wants to leave early to which the player must answer ''no''. Now save and reset the game. The player must now attempt to exit the Safari Zone. The attendant will ask if the player would like to join a Safari Game, to which the player must answer ''no''. Now the player should Fly anywhere. After taking 500 steps, the Safari Zone's PA will ring, and the player will be warped into the Safari Zone gate. By leaving the gate through the south exit, the player will enter Glitch City. Glitch City cannot be accessed if the player runs out of steps in Celadon City, Cerulean City, Lavender Town, Saffron City, Fuchsia City, Viridian City, Pewter City, Cinnaber Island, Vermilion City, or inside any building.
How can you Escape Glitch City?.
Well the only way to escape the glitch is to Fly or Teleport out of Glitch City. If you save in Glitch City and you don't have any Pokemon that can Fly or Teleport, you will be unable to escape.
BE CAREFUL!
Route 20
Running out of steps in Route 20 is cool. Because players are sometimes able to Surf north until they reach the barrier that normally prevents them from leaving Route 20 to the north. If the player gose to westernmost checkerboard pattern of water in the area, goes left of it one step, then back right, and presses start, the entire area will become Surffable water.
Rock Tunnel
While this location's Glitch City is not anything special, if the player runs out of time in this area without using Flash, the darkness effect will carry over into the Safari Zone itself. At this point, the player may pay to re-enter the Safari Zone and explore it in its entirety in the dark. Exiting into Glitch City simply results in the effect going away as usual.
Walk Through Walls
If the final step is taken as the player jumps a ledge, the player can walk through walls. and if the player has one Pokemon in the party that is poisoned, when it faints, the player will appear in front of a Pokemon Center. Remember the glitch is deactivated once a building or cave is entered. Well is time to go to Cerulean Cave .