It does not involve th Regis. It is a cave where it appears only when you beat the Elite Four. It only has Zubats on level 16. It's a waste of your time. * Not all level 16 Zubats. No waste of time. I had heard that if you went in you had 75% more chance of getting a shiny pokemon. I went to see and caught 6 shing zubats! People trade them for the best pokemon! It is a cave that alters it's positon. There is a chance that you can find ditto in that cave.
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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 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's random
It is Altering Cave which you can enter only after you beat the Pokemon league.
You can catch a Houndour in the Altering Cave in Pokemon FireRed.