You get balbasaur in cerulean city.
after you beat misty go to the house to the left of the pokecenter and talk to the girl in the back. she will ask you to take care of balbasaur for her. make sure you have an empty spot in your party for it, just in case.
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Whirlpool isn't in Pokemon Yellow Version.
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It is not possible to get the Red Gyarados in Pokémon Yellow version. You can only get it in Gold, Silver and Crystal version.
You can't get Togepi in Pokemon Yellow. Togepi does not exist in that Pokemon generation. (:
It increases your Pokemon's defense.