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
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Pokemon you can get with the good rod are: TENTACOOL, MARILL, MAGIKARP, CHINCHOU ( under-water ) and CORPHISH.
Sapphire is better, but yes, emerald is good.
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Torchick is a good Pokemon if you train it right anything should work
i just used Adore Pokemon and she gave me a lum berry