FireRed Pokémon

You need to buy water at the big shopping mall ;-)
It seems to be on the very top floor, it's Celadon if I remember correctly (haven't touched Pokémon in 5 years :D)
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(= The biggest bug in computing is what lies between the chair and the screen! =)

a grandma will give you tea in a building in Celadopole

then the guard will ask you for it and all the guards will let you pass

You have to go to Cédadopolé and go to the shopping center (at the very top) and buy a cool soda, then go to the caretaker, give it to him, and that's it!!!! It's as easy as saying hello.

Hello, you must go to Celadopolde, and in a house, an old lady will give you tea.

Do not confuse Fire Red and Red! This is what many have done here.

Il faut aller chercher de l'eau à Céladopole, tout en haut du grand centre commercial.

Il faut aller voir la grand-mère dans la ville où il y a le centre commercial, elle vous donnera du thé.

Merci, j'étais bloqué, mais là je suis encore pour Azuria. Après le conseil des 4, pourquoi le type pour la grotte ne me laisse pas passer ? Je ne comprends pas, j'ai battu la ligue et tout. S'il vous plaît, merci.

When you are in Azuria, you go to Route 210. At the end, there will be a cave to explore (you need Flash). At the end of the cave, you will arrive in Lavanville. You go left to reach the guard's house, but the guard won't let you pass. You exit and see a house (underground). You arrive in Celadon City, to the left of the Pokémon Center there is a big building. You enter and there will be an old lady surrounded by Pokémon; she gives you tea that you will give to the guard. THE END.

You need to give him water and he'll let you pass, okay love.