you need to have beaten misty in ceruleun city, then you can go through the house and get TM 28, dig
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It takes time but figure it out.... push the boulders
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.
You have to go to the next city and beat the team rocker hideout which is in the Game Corner.
press the red buton to raise the waterfall
You need the Silph Scope to see it, then defeat it.