Generation II Safari Zone
Alternative map locations (Generation I) | Alternative Route 104 map | Battle Park (Platinum) | Generation II Safari Zone | Haunted House | Jubilife Condominiums floors 3 and 4 | Map 0x0B (Generation I) | Map 0x6F (Generation I) | Mystery Zone | Record Corner (FireRed/LeafGreen) | R/S Flower Shop (Festa 2002 demo) | Special (location) | Special Area | Sevii Islands 8 and 9 | Unused Olivine City house | Unused Sunyshore City house | Unused Celadon City house
Though the first generation of Pokémon games's Safari Zone was made inaccessible in Pokémon Gold, Silver, and Crystal, it was never completely removed from the game. The area is only accessible using hacking or cheat devices.
GameShark Codes
Two sets of GameShark codes are listed here: one to access the gatehouse leading into the Safari Zone, and another to access the Zone itself.
The codes to access the gatehouse in Gold and Silver are:
010344D0 015045D0 010343D0
The codes for Crystal are:
0101B4DC 0103B5DC 0159B6DC
The codes to access the Safari Zone directly in Gold and Silver are:
010143D0 010344D0 015145D0
The codes for Crystal are:
0101B4DC 0103B5DC 015AB6DC
After activating the proper codes, the player must simply walk through any door. Once they have done so, they should deactivate the codes.
The Safari Zone
Assuming that a player used the gatehouse codes, they should find themselves inside of a typical gate building. This gate bridges Fuchsia City and the Safari Zone. Exiting through the south entrance will return the player to Fuchsia City, where the player will end up lodged in a wall.
If the player exits through the northern entrance, they will find themselves in an incomplete Safari Zone. The entrance is quite glitched, and the water is not surrounded by a coastline or sand, but the area is otherwise complete. The glitched entrance can be walked on, but the player cannot use it to return to the gate.
The Safari Zone appears to use the same tileset as the National Park, possessing both tall and huge grass. The map is rather small, and no wild Pokémon -- not even ????? -- appear in the grass. Normal Pokémon can be encountered by using the Super Rod at the pond, but none of them are specific to the Safari Zone.
Explanation
The existence of a Safari Zone map in the second generation of games clearly demonstrates that the programmers initially considered adding the Zone to the games. National Park, which uses the same tileset, may have been the Zone's replacement.
Furthermore, the "entrance" to the Safari Zone is still in the game as well. In the Pokémon series, doors are powered by "warps" -- invisible objects placed over doors. When a player steps on a warp, they are immediately moved to wherever the warp "pointed" -- and warps can only point to other warps. The doors in the games do nothing; it is the invisible warps placed over them that do the work.
Hackers have discovered that there is still a warp to the Safari Zone in Fuchsia City. The warp is unusable, however, because it was placed over a brick wall, which the player cannot walk onto. This is why, if a player exits the Safari Zone gatehouse using the south entrance, they end up standing on a wall -- that is the warp to and from the Safari Zone.