im guessing the middle wide house with cynthia's mom in it
That is for decoration.
You obtain hm03 Surf in the Celestic Town Shrine.
Beat the elite 4 and give the ruby and sapphire to the guy on island 1
A trainer on the celestic town side of route 210
in celestic town use a super rod in the ponds
In Light Platinum, to get to Celestic Town, you need to have medicine to give the Psyduck who are blocking the road just below the town on route 210. You get the medicine by beating the Pastoria Gym, then following and defeating the Galactic Grunt. Cynthia will give you the medicine to remove the roadblock, then you follow a short foggy path to the town.
You get the HM Surf.
In celestic town
in celestic town
you get it from the Celestic Town elder after you beat Cyrus
celestic town
You get Surf from the elder of Celestic Town.
you get it from cynthia's grandma in celestic town
That is for decoration.
It's hidden in Celestic Town.
Mt. Coronet; north of celestic town
once you get the national dex, you can catch them by celestic town