go to the north rustboro (city where you get the rock badge) where the woman is,
go to the beach and surf between the light brown rocks. You find a forest with 2 trainers and some weird looking berries, go in.near the karate guy you find some stairs and a pokeball, in that pokeball is tm1
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i think its somewhere in sinnoh
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.
My Guess is either buy it, trade it form a different game (XD gale of darkness has those Tm's) or just get get a Pokemon that has it
rotom isn't in Pokemon emerald