Pokémon Gold and Silver/Route 43

'''Take Route 43 to reach the Lake of Rage. Team Rocket seems to be in charge there, which can't be a good thing.'''

Team Rocket demands an exorbitant toll
Team Rocket has taken over the guardhouse on the east side of Route 43. They'll be happy to let you pass... for 1,000. If you don't want to pay, you'll have to loop around to the west. But that may be for the best; the grassy areas along Route 43 are the only places where you can catch a in Gold and Silver, or a  in Crystal.

After you've crushed the Rockets, the guardhouse will fall back into friendly hands, and you'll be allowed to pass freely. And the new guard will thank you with TM 36 (Sludge Bomb), an awesome Poison-type attack.

Pokémon found

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