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You gotta defeat Wake, the fourth gym leader, then go to the safari zone and talk to a guy hanging around near the lower right corner and he'll give you Defog, the HM05. Teach it to a Pokemon then you can clear off fog anytime! PS. You can't use it if there's no fog.
water+air=fog
you need to get the hm defog in the great marsh in pastoria city and have wake (gym leader in pastoria) beaten. then you ismply teach it to a flying type Pokemon
Get the HM Defog from the trainer inside the Great Marsh in Pastoria City and teach it to a flying type (such as Staraptor), then go to the menu and have Staraptor use it to clear out the fog.
The HM move Defog allows the trainer to clear the road ahead of any mist or fog. The fog makes it hard to see where you are going in the game, and also lowers your Pokemon's accuracy in battle. The move Defog in battle lowers the target Pokemon's evasiveness. HM05 Defog can be learnt predominately by Flying-type Pokemon.