easy just raise a starter Pokemon like empoleon,swampert,feraligater,or blastoise and if u want ucan hatch an egg and get.Last week i got a lv.100 empoleon and i put it in daycare with a ditto and when the hatched it was a lv.1 piplup and it knew hydro pump!this only works with a lv.100 starter Pokemon
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There isn't a TM called hydro pump you can only get a Pokemon to use if it can learn it leveling up
Feraligatr can learn Hydro Pump at level 58 in Pokemon Crystal.
hydro isnt a TM.
Swampert does not learn Hydro Pump.
Salamence can only learn Hydro Pump as an egg move in Pokemon Emerald.