Level 25.
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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.
Tentacool evolves at level 30 into Tentacruel.30
Tentacool evolves on Lvl. 30 into Tentacruel.
You can teach Tentacool the move Waterfall anytime. Waterfall is an HM, not a move gained by reaching a certain level.
It doesn't learn it at a level because it's a tm but it can be teached surf at any level