Every Pokémon fan has that one legendary moment from childhood — the time they first walked into Cerulean Cave, heart pounding, preparing to face the most powerful Pokémon in Kanto: Mewtwo. But what if we told you there’s a hidden glitch in Pokémon Red and Blue that lets you skip the entire Elite Four and battle Mewtwo way earlier than intended? No hacks, no cheats — just clever manipulation of the game’s original code. If you’re up for a nostalgia-fueled challenge that feels almost like unlocking a secret level, this guide is for you.
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How to Catch Mewtwo in Pokémon Red/Blue Without Beating the Elite Four
The world of Pokémon Red and Blue is filled with mysteries, glitches, and legendary exploits — and one of the most iconic is the method of catching Mewtwo without setting foot in the Pokémon League. This trick is a variant of the “Mew glitch” and takes advantage of how the game handles memory and events. If you’re a curious trainer ready to bend the rules, here’s your ultimate guide.
Step 1: Go to the Route West of Lavender Town
Your journey begins in Lavender Town. From there, exit to the west, leading you to Route 8. This area contains several trainers, but the one you’re looking for is a Gambler NPC near the entrance to the Underground Path. Make sure you haven’t battled him yet. This is crucial. Stand just above his line of sight, ideally one tile away from the visual trigger zone. Get ready — timing your next action precisely is essential.
Step 2: Interact with the Gambler Using a Start Menu Trick
Now comes the first big glitch action. Take one step down so that the Gambler sees you, but quickly press Start right before he initiates a battle. If done correctly, the menu will pop up just as the exclamation point appears above his head. Without hesitation, choose a Pokémon that knows Fly and escape to Cerulean City. If you’re successful, the Gambler will try to battle you, but the screen will fade out and you’ll be flying away before he gets the chance. This freezes your in-game menu — don’t worry, it’s part of the plan.
Step 3: Use Fly to Get to Cerulean City
Once you land in Cerulean City, you’ll find that your Start menu no longer works. This is normal and confirms that the glitch is active. Don’t save or reset. Your job now is to trigger a trainer battle that will influence what Pokémon appears when the game “unfreezes.” You’re effectively setting up memory values that will later spawn Mewtwo.
Step 4: Find and Defeat the Slowpoke Trainer on Route 25
Make your way north across Nugget Bridge and into Route 25, the path that leads to Bill’s house. Here, you need to battle a Youngster with a single Slowpoke. Again, ensure you haven’t battled this trainer before. This specific enemy Pokémon — Slowpoke — has a “Special” stat that influences the glitch’s outcome, and it’s what allows Mewtwo to appear later. Defeat him completely, and do not engage any other trainers on your way back.
Step 5: Carefully Return Without Entering Tall Grass
After winning the battle, head back to Cerulean City, but be extremely careful to avoid any wild encounters or additional trainers. Entering tall grass or triggering another battle can override the memory value you’ve just set. This would ruin the glitch and force you to start over. Stick to the path and take it slow.
Step 6: Go Find a Ditto and Let It Transform
Now, Fly to the area east of Fuchsia City where Ditto commonly appears — ideally in Route 15 or the grasses of the Pokémon Mansion. Make sure the first Pokémon in your party has a Special stat of 156 — Kadabra, Electrode, or Haunter with the correct IVs/EVs are good choices. Encounter a Ditto and let it use Transform on your lead Pokémon. This will copy its stats, including the one that dictates which Pokémon appears during the glitch. Don’t faint it right away; just make sure it transforms and then defeat it or run.
Step 7: Fly Back to Lavender Town
After the Ditto encounter, open your Pokémon menu and use Fly again — this time, return to Lavender Town. Don’t open any other menus during this part of the glitch. As you step out into Route 8 again, the final phase will begin automatically. Get ready.
Step 8: Close the Menu to Trigger the Encounter
As soon as you enter Route 8 from Lavender Town, your Start menu will automatically appear on its own. This is the critical sign that the glitch is functioning as planned. Do not select anything. Simply press B to close the menu. Instantly, the game will launch you into a wild Pokémon battle.
Step 9: Mewtwo Appears – Capture Him!
Just like magic — or rather, like memory manipulation — you’ll now be face-to-face with Mewtwo, one of the most powerful Pokémon in the game. Come prepared with Ultra Balls or a Master Ball, and maybe a status-inflicting move like Sleep or Paralysis to increase your odds. Remember, this is still technically a wild encounter, so once you faint him or flee, he’s gone. Make it count!
Conclusion: A Legendary Catch Before the League
Congratulations! You’ve just caught Mewtwo without ever battling the Elite Four. This glitch is more than a party trick — it’s a fascinating look into how early Pokémon games handled memory and trainer interactions. It takes a bit of patience and precision, but for fans of game-breaking exploits and nostalgic experimentation, it’s one of the most rewarding secrets in Pokémon Red and Blue. Whether you’re a speedrunner, collector, or curious explorer, this moment proves one thing: even decades later, the world of Kanto still has mysteries waiting to be uncovered.
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