Master Ball in Pokémon Blue (Game Boy): Unobtainable Normally

You cannot obtain a Master Ball in Pokémon Blue (or Red/Yellow) through normal gameplay.

Why It's Missing

• The Master Ball was introduced in Generation 2 (Gold/Silver/Crystal) as the prize for the Lucky Number Show (Radio Tower) or from Professor Elm.
• Gen 1 (Red/Blue/Yellow) only has: Poké Ball, Great Ball, Ultra Ball, Safari Ball.

Legitimate Ways to Catch Mewtwo/Legendaries in Blue

1. Weaken to 1 HP: False Swipe doesn't exist in Gen 1 → use Super Fang (halves HP) or careful damaging moves.
2. Inflict Status: Sleep (best, 2.5× catch rate) or Paralysis (1.5×). Use Hypnosis, Sleep Powder, Thunder Wave, Sing.
3. Ultra Balls: 2× catch rate. Stock 50+.
4. Save Before Battle: Reset if failed (allowed on cartridge).
5. "Slow Catch" Method: Tap A at specific frame? Myth. Just RNG.

If You Absolutely Need a Master Ball

• GameShark / Action Replay Code: 0101F1D0 (Item 1 = Master Ball). Risk: save corruption.
• Trade from Gen 2: Not possible—no backward trading.
• Play Gold/Silver/Crystal (3DS VC) – Get Master Ball legitimately there.

Tip: Mewtwo (Cerulean Cave) has catch rate 3 (0.4% per Ultra Ball at full HP, no status). Sleep + 1 HP + Ultra Ball ≈ 11% per ball. Bring 30–50.