Use dive.
There is no Celedon City in Pokemon Emerald
There is no Emerald City in the Pokemon Games, however, in the Land of Oz, the Emerald City is where everybody aspires to be
"Where is petalburg woods in Pokemon emerald?"Petalburg woods is west of petalburg city and south of rustboro city on route 104 in Pokemon emerald.
there is no contest house in Pokemon emerald
Yes in Lilycove City
mossdeep city dhoom
by surfing!
In Slateport City.
In evergrand city
You can get Dive in Pokemon Emerald by going to Mossdeep City and ensure you check all the houses.
there is no saffron city in Pokemon emerald, and there is no "Pokemon bluesea" but you can catch both Groudon and Kyrouge in emerald... blue sea is a fake created by some guy who needed some money.
sootopolis city