The Lake of Rage (Japanese: いかりのみずうみLake of Rage), also known as Gyarados Lake (Japanese: ギャラドスこGyarados Lake), is a location in Johto. It is located just north of Mahogany Town, connecting it with Route 43, making it the northern-most accessible point of the Johto region. A large lake spans the area of the Lake of Rage, with a few residents living nearby. It is said to be the largest lake in the region. West of the lake lies a labyrinth of trees, which hides a house.
It is said the Lake of Rage was created the last time many Gyarados got together and stirred up a storm. The crater that remained filled with rainwater and became the Lake of Rage. In the middle of the lake dwells a ShinyGyarados that had recently became irritable due to the radio waves transmitted by Team Rocket from their hideout in Mahogany Town. The Lake of Rage was considered a dangerous place to go, as the red Gyarados started tipping over boats and scaring swimmers.
In Pokémon HeartGold and SoulSilver it will rain at the lake every day except Wednesdays. When it rains, the lake will flood; this flooding is not present when the weather is calm. Different items are accessible and different Trainers appear depending on the weather.
To the northwest of the lake, there is a house hidden within a labyrinth of trees. Inside, a man will give players TM10 (Hidden Power) for locating the reclusive house. The path to this house begins in Route 43, on the western side. In Generation II, crossing the lake is not required, but it is the opposite in Generation IV, as the house is only reachable when the Lake is flooded. On Wednesdays, Wesley is found near this house, and will give the player a Black Belt the first time they meet, and then a Downcast Ribbon every week after having met all seven siblings (Generation IV only).
Southeast of the lake is another house, where a Fishing Guru resides. His greatest dream is to see the world's largest Magikarp, and he regularly measures those brought to him in order to realize it. If he is shown a Magikarp, he will calculate its size and give the player an Elixir if it is bigger than the largest one he had seen before. Initially, this record is 3'6" and held by Ralph.
The player can also Fly to the Lake of Rage; in Generation II it is the only destination in any game that can be flown to where the player will not land in front of a building, but in Pokémon HeartGold and SoulSilver the player lands in front of the Fishing Guru's house.
Normal Lake appearance (top) and flooded appearance (bottom) in Generation IV
The Lake of Rage, referred to as Lake Rage in the anime, was featured in Talkin' 'Bout an Evolution and Rage Of Innocence. Ash, his friends, and Lance learned that Team Rocket was conducting experiments at the lake as a part of their Project R, involving forced Pokémon evolution. Since the Red Gyarados was the only Pokémon in the lake to have been affected by their experiments, Team Rocket captured it for further studying. However, their project ended in a failure when Lance destroyed Team Rocket's research facility at the lake, followed by the Red Gyarados escaping and getting caught by Lance.
The Lake of Rage appeared in The Lake of Rage. Lance had briefly encountered and battled the Red Gyarados before at the lake, motivating him in investigating the Team Rocket HQ in Mahogany Town. After the radio wave generator that had forced Gyarados to evolve had been destroyed, Lance revisited the lake to see that the Red Gyarados had calmed down.
In the manga
In the Pocket Monsters HGSS Jō's Big Adventure manga
Gold follows Silver to the Lake of Rage. Looking for him, Gold is surprised by a group of Gyarados thrashing around in the water. The locals flee, but Gold spots Silver running towards the lake. Nearly crushed by a glancing attack, Silver tells Gold that there are strange radio waves in the area, forcing the wild Pokémon to evolve. Silver flies off to find the source of the radio waves, leaving Gold alone to deal with multiple angry wild Gyarados by himself.
Interference on their Pokégear reveals the source to be a Red Gyarados in the center of the swarm. Silver captures it, thus stopping the rest from rampaging. But it's only a matter of seconds before the two boys begin arguing again.
Suddenly, a fog covers the area. Gold instantly recognizes it as that of the Masked Man. Secretly setting up a ring of razor-sharp icicles around them, the two boys fight alongside each other, before the Mask's taunting gets the better of Silver. Chasing after him alone, Silver calls upon all of the wild Gyarados in the Lake (as the Red Gyarados is the leader of them) and uses their combined strength to attack the Mask.
Meanwhile, Gold is busy dealing with some of the Mask's Pokémon by himself. After cleverly defeating them, he hurries after Silver, only to find the entire lake frozen solid. Silver and his Gyarados are knocked out. Gold runs to him, only to see a giant chunk of ice smash into Silver, throwing him into the water. Claiming that Silver was being punished, the Mask then attacks Gold as well. The last few panels show Gold and his Aipom the instant before a giant chunk of ice is about to hit them, and the impact. Gold's hat and goggles are seen tossed into the air.
Many weeks later, Lt. Surge returns to the battle site to find the Red Gyarados frozen in the lake, and managed to procure both the boys' belongings and the Gyarados itself when it knocks itself out trying to smash open a mass of ice containing Gold and Silver's baggage.
A possible prototype of the Lake of Rage
Unused debug text in Japanese Crystal spells the lake's name as 「イカリのみずうみ」, with ikari in katakana (イカリ) as opposed to the usual hiragana (いかり). Additionally, there is a leftover map in Gold and Silver that includes a Pokémon Center, Poké Mart, and even a Pokémon Gym surrounding a lake that is a similar size and shape to the Lake of Rage.
Even though it is said that Team Rocket's radio signal is evolving all the Magikarp in Lake of Rage, Magikarp can still be found there at any time. Even if the radio signal is being listened to on the Poké Gear, Gyarados do not show up more often.