In emerald you need to beat the league and in fr/lg you need to unlock all 7 of the sevii islands
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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.
there is no reason to altering cave. It's something that the designers put in there but didn't have any time to do anything to it.
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.
It is Altering Cave which you can enter only after you beat the Pokemon league.
it's random