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| Attack Information |
| Hydro Pump does nothing aside from causing damage.
Hydro Pump receives the flinching bonus when King's Rock is attached to the using pokémon. Hydro Pump is affected by Brightpowder when the opposing pokémon is equipped with it. |
| Learned By: |
| Naturally |
| Squirtle | Wartortle | Blastoise |
| Psyduck | Golduck | Poliwag |
| Poliwhirl | Tentacool | Tentacruel |
| Horsea | Seadra | Staryu |
| Gyarados | Lapras | Vaporeon |
| Omanyte | Omastar | Totodile |
| Croconaw | Feraligatr | Chinchou |
| Lanturn | Qwilfish | Kingdra |
| Suicune | Lugia |
| Breeding |
| Goldeen | Mantine | Totodile |
| Previous Evolution |
| Poliwrath | Seaking | Starmie |
| Croconaw | Feraligatr | Politoed |
| Previous Game |
| Kabuto | Kabutops |
