You can't, unless you mean secret base.
You have to have a Pokemon with Secret Power.
Use Secret Power in front of a tree or an indention in rock.
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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.
rotom isn't in Pokemon emerald
where do you get the spade from on Pokemon emerald
defog is not in emerald,