It's the Squirtbottle, not Squirtle Bottle.
To obtain it you need to have beaten Whitney in the Goldenrod Gym. go to the house next to the gym (top) after beating her and you'll get the bottle.
But before you go to the house go to RT 35 then go to the top right and cut the tree and talk to the girl in blue in front of tree THEN goto the house and get the bottle (After you beat Whitney.
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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 cannot find Squirtle in Pokémon Crystal.
you can get treecko by shacking the trees on ilex forest
its in haus in Goldenrod city
A house in Goldenrod City.