After defeating Lt. Surge, the Gym Leader of Vermilion City, you can talk to Officer Jenny nearby the Gym and she will give you a Squirtle.
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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 can only get Squirtle in LGFR.
Get the Thunder Badge And Talk To Jenny And She Will Give You One
talk to officer jenny after getting the thunder badge
go to the 3rd gym badge place battle the gym leader, beat him , talk to officer jenny for your squirtle.