You have to trade of of another game or once you beat the elite four go to route 224 and use the pokeradar. You also have to complete your national pokedex to get your pokeradar from professor rowan.
My friend said he just found it in the survival area near that place but I want one and I don't have emerald
You find it on route 209 if your lucky it takes patience it is 100 times harder than finding a shiny feebas.
You use the pokeradar in route 224 it may take some time when I was looking for it I found a shiny weepinbell
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rearange the letters
rearange the letters