By defeating/capturing the red grades in mahogany town and in the info plate a trainer you never saw appears his name OS lance and he wants you to help him with the magikarp mystery.......
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Route 43 after you beat the Team Rocket in Mahogany Town
You have to beat the gym leader, Pryce, in Mahogany City.
In Mahogany Town you have to go to the house north of the Gym and Pokemon Center (the one directly between the two). Lance will be there and so will Team Rocket. You've got to beat Team Rocket before Lance will give you HM06 Whirlpool.
First you have to beat Team Rocket in Mahogany Town and Lance will give you the HM Whirlpool. You also have to beat the Mahogany gym to be able to use it.
In mahogany town where he will want help to beat team rocket there