how do you catch a magickarp in pokemon white?

Question

i want a magickarp and was wondering how to catch it in white

Answer 1

First off, turn those answers into comments up there.
Go to Marvelous Bridge. A man will sell you one for 500. You must have room in your party.
Oh yea, welcome to the site.

Comments

it will also be at level 40

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LEVEL 40???? You mean Level 5.

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oh yeah i migrated one and it was level 40

Answer 2

you can only catch one by going to marvelous bridge and a guy at the beginning of the bridge he will give you a magickarp for $500 (make sure you have an empty space)