i'm here at poni breaker coast finding a sharpedo and nothing just magikarps

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Magikarp has a 50% chance of appearing in bubbling spots, while Sharpedo has a 10% chance of appearing in bubbling spots. The reason you mostly find Magikarp is because it has a higher chance of appearing than Sharpedo. If you aren't fishing in bubbling spots Magicarp has a 75% chance of appearing, while Sharpedo only has a 1% chance of appearing so... It will take a while to find a Sharpedo.