all the legendaries and how to get them here http://www.psypokes.com/emerald/legendaries.php
In Pokemon Emerald, Groundon and Kyogre are legendary Pokemon. You can find them in the Marine Cave and the Terra Cave.
If you count sudowoodo as a legendary then yes
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.
Up your butt an around the corner
they are the three legendary pokemon of rock, ice and steel. they are know as regirock, regice, and registeel. you can find them in Ruby, Saphire, and Emerald.
rayquaza
The three legendary Pokemon in Pokemon emerald is Kyorge, Groundon and Rayquazer.
Groudon, Kyogre, and Rayquaza. Groudon is the fire legendary pokemon, Kyogre is the water legendary pokemon, and Rayquaza is the air legendary pokemon.
Raquaza (sorry if I mispeled that)
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.
legendary Pokemon cant breed
YOU FIND RAQUAZA IN SKY PILLARYOU FIND RAQUZA IN SKY PILLAR