Get the tea from the lady in the area with the mall (forget what it is called) and talk to the guard.
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You give the guard a drink, but he gives you nothing, unlike the kinder guards in Kanto surrounding Saffron City.
you need to get tea in celedon city and give it to the guard
the lady in the big house in celadon city will give you tea and then give it to the guard youre welcome
What exactly are you talking about? If it's to get into Saffron City, then a person in Celadon will give you the 'tea' item and you take it to the guard in the guardhouse blocking Saffron City.
Give the tea to the security guard that is blocking saffron city and he will let you through.