No the magikarp with white whiskers are females I find alot of those in the river in route 208.
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No. Female Magikarp all have white whiskers.
You can't, but you could get a magikarp by a guy on marvelous Bridge. You have to pay if you want the magikarp.
Gyarados is rare to catch, but you can try in the water of Sootopolis City. It's much easier to catch a Magikarp and evolve it into Gyarados at level 20. You can find Magikarp anywhere by fishing with the Old Rod.
Magikarp evolves at lvl 20 or 21. I put my magikarp in the datcare for 2 days and it was already higher then level 20. You can also evolve Magikarp by giving it rare candies, or training it.Also, by putting it in the daycare, it will learn the move tackle. Hope This Helped! but don't worry if u can't evolve it, there's a red gyrados in the game and it's really easy to find.
In Pokemon Platinum, go to the Resort Area (South of Route 229) and use the Super Rod in the pond by your villa. There's a small chance you can get a rare, wild level 100 Magikarp. (The level ranges from 1 to 100.)