How do you get to celadon?

get a drink at the top of the celadon department store and the guard will take the drink and let you pass to safron

..Uh...i think you mean the Pokemon mansion...that's on cinnabar island...youd haf 2 surf 2 ther from pallet town if u havnt been there...othrwize fly there...cuz celadon duznt hav a mansion...it duz...

Once at Lavender Town, go on the path to the west of the town. Once at the end of the path go in the underground tunnel.

defeat the celadon city gym defeat celadon city gym the grunt will come running at you challenging you to a battle when you defeat him there will be a grunt blocking the door to the celadon hotel...

You have to go through the passage west of Lavender Town, you will then be just east of Celadon.