Groudon = Land Cave
Kyogre = Undersea Cav
After waking up Raquaza and having him stop their war, the weather institute (all the way north of Route 119, to the left of Fortree City) will report abnormal weather patterns on various routes. Go to those areas and enter either a hole in the wall or a dark patch of water (using dive) and you'll find a cave where Groudon or Kyogre can be fought, respectively. Raquaza can be found on Sky Pillar (route 131, east of pacificlodge town).
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its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
Unfortunately you cannot get the legendary dogs Entei, Suicune, and Raikou in Emerald Green. You can import them into Emerald green by trading from Leaf Green and Fire Red.
There are no breedable legendary Pokemon in Emerald. In Diamond/Pearl/Platinum Manaphy is breedable with a Ditto. However, the offspring will be a Phione.
no not really . . .
The three legendary Pokemon in Pokemon emerald is Kyorge, Groundon and Rayquazer.