You get it as your starter Pokémon, if you chose it.
You can trade from firered version on second floor of the Pokemon center after you get the pokedex.
If you didn't choose squirtle as your starter Pokemon you need another firered or leafgreen to trade one to you.
Suicune is on Firered. She can be caught with a Charmander there. Leafgreen too. Trade her to Emerald.
charmander,bulbasaur,squirtel
bulbsaur,squirtel because they can beat the 1st 2 gyms.
Give Pikachu an Attitude Adjustment with squirtel!
You can't catch a Squirtle in Pokémon Pearl. You have to trade it from Pokémon HeartGold or Soulsilver. You can also migrate it from Pokémon FireRed or LeafGreen.
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.
beat the 3rd gym and talk to someone at vermilion city
To get Pokemon firered on PC download a vba and Pokemon firered ROM
Yes there are shiny Pokemon in firered