How to Find Flash in Pokémon FireRed: Location, Requirements, and What It Does

Flash is one of those moves in Pokémon FireRed that players either forget about entirely or desperately need when they're lost in a dark cave. Either way, knowing where to get it — and what's required before you can — saves real frustration. Here's everything you need to know.

What Is Flash in Pokémon FireRed?

In Pokémon FireRed, Flash is a Normal-type move that lowers the opposing Pokémon's accuracy by one stage. In battle, it's a defensive utility move — not a damage dealer. Its more practical use, however, is illuminating dark areas like Mt. Moon or Rock Tunnel, which are otherwise nearly impossible to navigate without it.

Without Flash (or without using it in dark caves), your field of vision on the map shrinks to almost nothing, making navigation a serious chore.

Where to Get Flash in Pokémon FireRed

Flash is obtained as an HM — specifically HM05 — in Pokémon FireRed. Unlike most items you pick up off the ground, HMs are given to you by NPCs at specific story points.

The Location: Route 2

Flash is found on Route 2, the path connecting Pallet Town's northern neighbor, Viridian City, to Pewter City. Specifically, it's handed to you by Professor Oak's Aide, who is waiting in a building on the southern section of Route 2 — the part you can only access after passing through Viridian Forest and then cutting back south via the Diglett's Cave exit.

Here's the key detail most players miss: you access this building from the Diglett's Cave side, not from Viridian City. The building sits between Diglett's Cave (on Route 2's south end) and the gatehouse leading back toward Viridian City.

Step-by-Step Path to Flash

1. Progress through the game until you've beaten Brock (Pewter City Gym Leader) and reached Cerulean City
2. Head east from Cerulean City and eventually reach Vermilion City
3. From Vermilion, find the entrance to Diglett's Cave (just west of town on Route 11)
4. Walk through Diglett's Cave — it's a short, single-path tunnel
5. Exit on the Route 2 side (north end of Diglett's Cave)
6. Enter the small building immediately to your north
7. Speak to Professor Oak's Aide inside — he'll hand over HM05 Flash 🎮

The Catch: You Need 10 Caught Pokémon First

Professor Oak's Aide won't just hand Flash over to anyone. There's a prerequisite: you need to have caught at least 10 different Pokémon species and have them registered in your Pokédex.

This is the variable that trips up players who try to grab Flash early. If you've been playing casually and skipping wild encounters, you might arrive at the aide's building and get turned away.

When Should You Actually Get Flash?

This depends on your playstyle and how far along you are. The most practical window is before you attempt Rock Tunnel, which is east of Cerulean City on Route 9. Rock Tunnel is one of the darkest, most disorienting dungeons in the game and has no map. Without Flash, navigating it is possible but genuinely difficult.

Mt. Moon (which comes earlier in the story) is technically a dark dungeon too, but it's short enough that most players push through without Flash. Rock Tunnel is where the lack of it really stings.

If you're doing a completionist or low-frustration run, picking up Flash right after clearing Diglett's Cave is a natural detour that pays off quickly.

Teaching Flash to a Pokémon

Once you have HM05, you'll need to teach it to a Pokémon in your party. Any Pokémon that can learn Normal-type moves via HM is a candidate. Common early-game choices that can learn Flash include:

• Pikachu
• Clefairy
• Jigglypuff
• Oddish
• Most Normal-type Pokémon

⚡ One important consideration: HM moves cannot be forgotten without the Move Deleter (found in Fuchsia City later in the game). Teaching Flash to a Pokémon you rely on heavily in battle locks it to a move slot until you reach the Move Deleter. Many players keep a dedicated HM "mule" — a Pokémon they don't use in battles — specifically for carrying HM moves.

Does Flash Matter in Battle?

Flash sees occasional competitive use because accuracy reduction stacks. Using it multiple times forces opponents to miss more frequently, which can be useful in longer fights or when you're stalling. In the main story, though, it's rarely a battle-winner. Its value is almost entirely in exploration.

Some players skip Flash in battle entirely and just use it to light up caves when needed, then delete it via the Move Deleter once they're done with dark dungeon areas.

The Variables That Shape Your Experience

How useful Flash turns out to be in your playthrough depends on a few factors:

• How many Pokémon you've caught — if you haven't hit 10 yet, you'll need to grind encounters before the aide gives it to you
• Which Pokémon you want to teach it to — some players don't want to sacrifice a move slot on their main team
• How tolerant you are of navigating dark caves blind — Rock Tunnel without Flash is doable, just tedious
• Whether you're playing on original hardware, an emulator, or Virtual Console — the core game mechanics are identical, but save states on emulators change how much a missed item actually costs you

Your approach to these factors determines whether Flash becomes an essential early pickup or something you grab — or skip — as a convenience.