Navigating pitch-black caverns like Rock Tunnel is one of the most memorable challenges for players exploring the Kanto region. To illuminate your path and avoid stumbling blindly through pitch-black mazes, acquiring HM05 Flash is essential. This comprehensive guide outlines the exact requirements, prerequisites, and steps needed to obtain this vital utility move.
Essential Prerequisites and Requirements
Before attempting to get HM05 Flash, trainers must satisfy two key story requirements. First, you need to defeat Gym Leader Lt. Surge in Vermilion City or obtain HM01 Cut from the Captain aboard the S.S. Anne to clear blocking trees. Additionally, you must register at least 10 unique species in your Pokédex to prove your progress to Professor Oak's research team.
Catching 10 distinct Pokémon is fairly simple if you explore early routes and utilize basic Poké Balls. If you fall short of the required threshold, spending a short time catching wild encounters near Viridian Forest or Route 11 will quickly fill out your Pokédex.
Finding Professor Oak's Aide on Route 2
The journey to retrieve the Flash HM begins by traveling east from Vermilion City toward Route 11. Locate the entrance to Diglett's Cave and trek all the way through the underground tunnel until you emerge on Route 2 near Pewter City.
Once outside on Route 2, head south toward the small outpost building. Use your Pokémon with Cut to clear the small tree obstructing the path and step inside. Speak to the scientist inside, who is one of Professor Oak's aides, to receive HM05 Flash as a reward for your catching efforts.
How to Use Flash and Best Pokémon Choices
After acquiring HM05 Flash, teach the move to a compatible Pokémon in your party from your inventory menu. While Flash lowers enemy accuracy during battles, its primary purpose is brightening dark interiors like Rock Tunnel.
Because Flash provides minimal tactical advantage in competitive battles, it is best taught to utility Pokémon rather than your primary combat team. Common choices for learning Flash early in the adventure include Meowth, Pikachu, Voltorb, or Paras.
