you need to defeat the elite four then you fly to fortree city and go to route 119 to the weather insitute and talk to the professor he will say the route where it is
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its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.
There is no Autosave in Pokemon Emerald.
defog is not in emerald,
rotom isn't in Pokemon emerald