Yes, there is, there's a foe with one at the battle tower.
Feraligatr can learn Hydro Pump at level 58 in Pokemon Crystal.
you have to trade
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM
You cannot catch a Feraligatr in Pokemon FireRed. You can, however, transfer one from Pokemon Colosseum by catching Croconaw and evolving it into Feraligatr, then transferring it.
Yes, there is, there's a foe with one at the battle tower.
Feraligatr is a Water type pokemon.
Feraligatr can learn Hydro Pump at level 58 in Pokemon Crystal.
you have to trade
You cannot find Feraligatr in Pokémon Diamond however you do have the option of trading with another player that might have started with Totodile in Pokémon HeartGold or Pokémon SoulSilver additionally if you have Feraligatr in Pokémon Ruby, Sapphire, FireRed, LeafGreen or Emerald then you can use Diamond's Pal Park feature in order to migrate it over into the game so that it will now be in Diamond however once it has been migrated over it cannot be returned to Ruby, Sapphire, FireRed, LeafGreen or Emerald.
Feraligatr is #160 in the national pokedex, and it is a Water type Pokemon.
The only way to get a Feraligatr is to pick Tododile as your starter Pokemon and evolve him into a Croconaw at level 18 and finally into a Feraligatr at level 30. You can also trade from other games to get a Feraligatr.
Nowhere
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
There is no Pokemon convention in firered.
feraligatr