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Invest in this shiny Gyarados or not?
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I'm assuming you already have a few Gyarados and have plenty of fast TMs. Use a fast TM on this and throw it in a gym to show off. You can power up later if you decide you need it. You aren't going to put Gyarados in a gym that you want to hold for a long time (such as before a raid), so it isn't too important to power up.