nobody this is the johto leage sorry
Only by trading a Squirtle to HeartGold.
HeartGold and Soulsilver
squirtle to wartortle lv 16 wartortle to blastoise lv 36
You need to pick Squirtle as your starter,And evolve him into Blastoise.other than that no idea.
You can get a Squirtle after you obtain all 16 badges and defeat Red.
You can't obtain Squirtle or any of its evolutions in Black or White, so you will have to migrate a Squirtle from Pokemon HeartGold or SoulSilver Version. If you don't know how to obtain Squirtle in HeartGold or SoulSilver, you have to beat Pokemon Trainer Red, who is at the top of Mount Silver, and obtain all 16 gym badges. Then, Professor Oak will let you choose one of the Kanto Starters in Pallet Town. Hope this helped!
You have to battle blue. From there the game is technically done but you can get new starters such as Squirtle.
You can't hatch a Blastiose because it's not the first evolution, but you can hatch Squirtle.
Afterwards, Professor Oak will give you a Generation 1 starter (Bulbasaur, Charmander, or Squirtle)
Squirtle is a Water type pokemon.
Squirtle is not available in Pokemon Crystal. Squirtle can only be found in Pokemon Red, Blue, or Yellow. Squirtle can be traded to Crystal from those titles.
You get Squirtle as one of the starter pokemon.