Blastoise learns it at level 68. .
What Level Does Squirtle Learn Hydro Pump?
I think it's level 68
Squirtle cannot learn hydro pump only blastoise can. But blastoise can learn it between level 45 and 60
Squirtle learns at level 48 but you cannot evolve him at all... Otherwise blastoise is 68. So hold out the evolution!!!
He learns it at level 12