Use surf. And go down to talk to Cynthia, who will have you run an errand to her grandma in Celestic Town.
Hope this helps. :)
In Valor Lakefront
it is the hotel you go through to get to valor lakefront=)
use the pokeradar on the grass at valor lakefront
Talk to Dawns sis and she will say its on the Valor Lakefront
a trainer in the valor lakefront restaurant has one.
You cant you have to go with the storyline.
There's nothing blocking you to get into Valor Lakefront. To get into Lake Valor, you must have defeated Gym Leader Bryon and have talked to Prof. Rowan in the Canalave City Library.
the grass bit on valor lakefront. p.s. you need the pokeradar
sunnyshore city which is located near valor lakefront
we find him in valor lakefront and in the HQ in veilstone city after defeating Cyrus.
south of veilstone, and if that isn't enough look at your town map that you got at the begining of the game
cynthia is in front of valor lakefront. She will give you a medicine to cure the psyduck to get to her grandmother's house. if u read the book it will tell u about manaphy, the king of the sea.