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DT Gyarados? What is it good for?
So I’ve already gone ahead and TM’ed my best Gyarados to W/HP, but what about these other moveset combos? Which would be the better way to go? Especially these B/O ones.
Definitely keeping as is:
3027 W/HP
2818 DT/O
2741 B/C
The rest are up for suggestions. I have 550 Karp candy so I can always try for a better W/HP one. Should I TM DT/HP to DT/O or W/HP or even simply keep it?

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Here are mine, and I'm happy with the moves mine has...5 water gyarados; 1 dragon; a shiny dark...I have 1 magi candy left...my 100% water is stuck for now. (Walking Feebas candy). You listed 3 to keep as is, that leaves 5 others (ignoring shiny)...I would change any you have or will take to 2700+ to WF/HP