You can find it in the top floor in Mt. Pyre just go down the stairs near the hole that makes you fall through the floor. There should be a Poke Ball thingy containing TM30(Shadow Ball).
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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.
defog is not in emerald,
where do you get the spade from on Pokemon emerald
rotom isn't in Pokemon emerald