It's in Lilycove City.
OK so first you will need to win the Master Rank of the Pokemon Contest to one Pokemon then talk to the painter and it will be in the museum.
it is in sootopolis city but under water in satapolis city Museum
Go to Steven's House in Mosdeep City after you beat everyone in the Museum there.
The web address of the Emerald Triangle Museum is: www.emeraldtriangle.sc/museum/
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
go to stern,s shipyard and talk to the first man you see
HM08(Dive) can be found at Steven's house after clearing the Space Museum in Mossdeep City. Steven's house is north of the Mossdeep Pokemon Center.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
he is on the top floor of the boat house (wooden building with a boat beside it) south of the museum
Beat the elite four after having seen all 150 of the diamond/pearl Pokemon, then you will receive the national dex. From there, the fossils of the two can be found underground in the walls- take them to the Oreburgh museum to revive Lileep and Anorith.In Pokemon emerald only one may be selected.
There is no PalPark in Pokemon Emerald.
Sinnoh Pokemon DO NOT EXIST IN EMERALD!!!