Pokémon Gold and Silver/Lake of Rage

'''Strange things are happening at the Lake of Rage. Gyarados are taking over the waters, which were once packed with Magikarp. Team Rocket is at it again!'''

Capture the red Gyarados
You don't need to capture this to proceed, but you do need to battle it, so you might as well. After all, when are you ever going to see another Shiny red Gyarados? Save your game, then surf up to the Gyarados floating in the lake. Whether you capture it or K.O. it, you'll get the Red Scale when the battle is over. Take this to Mr. Pokémon way back on and he'll swap it for an EXP Share. After you defeat Team Rocket, return to the lake to find new trainers who will appear for you to battle.

This may be many players first introduction to Shiny Pokémon, which are incredibly hard to come across in normal Pokémon hunting.

An unexpected ally vows revenge
When you make it back to the shore, you'll meet Lance, the elite Dragon trainer that Red defeated in Red/Blue/Yellow. He isn't here to start trouble, but to stop it; follow him to the item shop in Mahogany Town and together.

Catch Magikarp for prizes
When Team Rocket in Mahogany has been thoroughly defeated, come back here and check out the sign outside of the cabin in the southeast corner of the lake. If you can fish up a bigger Magikarp than the record it lists, you can collect a prize from the guy in the house: a Max Ether.

The western path to the lake
Take the west exit out of Route 43 to the area, and you'll arrive at a man's house. He'll give you TM 10 (the very odd Hidden Power move). Continue east for TM 43 (Detect).

Mr. Wednesday's Blackbelt
Wesly, the man in the corner of the Lake of Rage, below the house, only comes out on Wednesday. He'll give you a Blackbelt, which powers up Fighting-type tehniques.

Trainers & Items
Reminder: Trainers only appear after the Rockets are cleared out.

Pokémon found (Water)

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