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It is Altering Cave which you can enter only after you beat the Pokemon league.
There is no altering cave in pookemon red since the sevii islands don't exist in Pokemon red only in Pokemon firered and leafgreen in six island after going past the forest and the altering cave is also in Pokemon emerald in route 103 a cave appears after beating the elite 4.
Yes, it is in Safari Zone (After you get the National Dex) and in Altering Cave.
After national dex you find it at altering cave its Levels: 20 +
Only zubat can be found in Altering Cave. Altering Cave was a location intended to be used for an event where Mystery Gifts could change the pokemon encountered in the cave, but these Mystery Gifts were never officially distributed.