You can teach Tentacool the move Waterfall anytime. Waterfall is an HM, not a move gained by reaching a certain level.
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Tentacool will learn Bubblebeam at level 19; Water Pulse at level 33 and Hydro Pump at level 47. You can always teach him the following TM's and HM's: Scald, Rain Dance, Surf, Whirlpool, Dive, Waterfall and Brine.
Level 25.
Sharpedo doesn't learn waterfall by level-up.
It doesn't learn it at a level because it's a tm but it can be teached surf at any level
i think that wooper can't learn waterfall at a level.