Go to the huge mart, idk which town, then go up all levels to the roof, talk to the person up there, (near the edge on the right hand side) and they'll give you substitute
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For baton pass breed a female absol with a male Pokemon that knows it, such as ninjask, girafarig etc. For substitute it can be taught by a move tutor somewhere. If you've already used that then get a (miss) mime that knows sustitute and baton pass and breed it with a male absol.
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
The coast emerald is called emerald cuz it is green and emeralds are green.
Emerald ore is 129. Emerald block is 133. Emerald stone is 388.
How do you get a gengar in emerald