actually the scanner is ina pokeball in rm 2........
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you get the scanner on the abandoned ship.
there is no scanner on fire red/leaf green. Only on ruby, sapphire, emerald
The scanner can be found in the abondand ship on route 108 in Room 2... but first you must have a Pokemon that can use the dive hidden machine and you must find the room keys to the other rooms that are lying in the rooms. Its is an easy process
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.