Tentacruel doesn't evolve, it is the final form of that pokemon. If you mean what level does Tentacool evole it is level 30.
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Tentacool evolves into Tentacruel at level 30.
Tentacool evolves into Tentacruel at level 30.
Tentacool evolves at level 30 into Tentacruel.30
Tentacool evolves on Lvl. 30 into Tentacruel.
tenticool evolves into tentacruel