You get Squirtle as one of the starter pokemon.
Get it for your starter Pokemon
The starter Pokemon are Bulbasaur, Squirtle, and Charmander.
You can't. Squirtle is a starter Pokemon, you have to trade it into your game.
If you picked Squirtle as starter, you can evolve your Squirtle into Wartortle. Otherwise you'll have to trade with someone who picked Squirtle as starter.
You can only get Raikou if your starter Pokemon was squirtle. If it was your starter Pokemon then you'll have to search around the regular region, he's not in the islands. He's just around in the grass somewhere and he changes areas whenever you do. If your starter Pokemon wasn't squirtle... well, good luck with trading for him.
Bulbasaur.
You can only obtain squirtle as your starter pokemon( your first pokemon) or through trade.
They are bulbasaur, charmander, and squirtle.
Bulbasaur, Squirtle, Charmander.
Bulbusaur, Squirtle, Charmander.
You can't get Squirtle in the PokeWalker; it's a Kanto starter Pokemon.