There is only one region in Emerald. That is the Hoenn region. However the Battle tower might be separated from the main map. You may could that as a new "region" if you wish.
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You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
It is not possible to change the in-game region on Pokemon Emerald. Each Pokemon game is coded to be set in only one region. This means only data for the Hoenn region exists in Pokemon Emerald. Pokemon Gold, Silver, Crystal, HeartGold and SoulSilver are the exceptions as they are set in Johto and Kanto.
Pokemon Emerald takes place in a different region than Kanto (the home of Pallet Town). You cannot go there in Pokemon Emerald.
The Hoenn Region is available in the pokemon versions Ruby, Sapphire, and Emerald.
In Pokemon Emerald, it's impossible to leave the Hoenn Region. The Kanto, Johto, and Sinnoh Regions are inaccessible in Emerald. Sorry.