First the Pokemon you want to release will have to be situated inside your Pc.
Then choose it and pick ''Relase'' from the menu that appears.
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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