you go to the cave behind moss deep in there u can catch a seal or sealo lv 30 or something. then u have to evolve it into walrein at 45.
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Spheal evolves at level 32 into Sealeo. Sealeo evolves into Walrein at level 44. http://serebii.net/pokedex-dp/363.shtml
sealeo evolves into a walrein in level 44.. good luck in your Pokemon adventure
Swampert is a pretty good choice but if you chose a different starter then other good ones would be Milotic, Walrein, and maybe even Crawdaunt
milotic of course
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.