Pokemon Crystal walkthrough section
Pokemon Crystal Phase 7: Mahogany and Lake of Rage — Red Gyarados
Glacier Badge Mahogany's "souvenir shop" is a front for a Team Rocket base broadcasting a radio signal that force-evolves Magikarp.
Phase 7 Glacier Badge Crystal story legend Route 42, Lake of Rage, Rocket HQ, Goldenrod Radio Tower, Suicune, and Pryce. 07 / 12 
Suicune Phase 7 section 2 of 7
Mahogany's "souvenir shop" is a front for a Team Rocket base broadcasting a radio signal that force-evolves Magikarp.
GuidePokemon Crystal
PhasePhase 7
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Mahogany and Lake of Rage — Red Gyarados
Mahogany's "souvenir shop" is a front for a Team Rocket base broadcasting a radio signal that force-evolves Magikarp. North via Route 43 is the Lake of RageNormal, churning with angry Gyarados — including a famous one.
Red Gyarados
Missable: The Red (shiny) Gyarados is a single static Lv 30 encounter in the middle of the Lake of RageNormal. It's the guaranteed shiny of the game — save before you SurfWater into it and don't KO it. A weak status (Thunder WaveElectric) + a Great/Ultra Ball locks it. Afterward, a fisherman gives you a Red Scale (trade it in Blackthorn for an Exp. Share-type reward).
Talk to Lance at the lake — he's investigating the signal and leads the assault on the Mahogany hideout with you.
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