first off there is no such thing as a waterfall TM waterfall is an HM and it is located in the cave of orign in sootoplis city and can only be obtained when you enter to fight groudon/kyogre and if by some chance you miss it or ''forget' it then you will have to start the game again unless the last time you saved was before entering the cave.
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There is not a tm for bite or crunch.
you can get it in seafloor cavern
at the game corner
In the Safari Zone
bendover and ill show you