Ditto DV manipulation

Miscellaneous glitches of Pokémon Red and Blue and Pokémon Yellow

Amazing Man (Red and Blue only) | Cable Club escape glitch | Celadon looping map trick | Champion Blue music muting glitch | Coastal Flooding | Confusion and Substitute glitch | Cooltrainer move | Cycling based glitch maps | Escape sprite handling glitch | Evolve without an evolutionary stone (Red and Blue only) | Evolving Raichu (Red and Blue only) | Expanded item pack | Expanded Pokédex | Focus Energy glitch | Get stuck in a wall | Ghost Bicycle glitch | Glitch encounter system | Glitch City RAM Manipulation | Infinite Blaine Door | Introduction Nidorino glitch (Red and Blue only) | Invisible PCs (Red and Blue only) | Invisible tree glitch | Item stack duplication glitch | Mute the music in the Pokémon League | Partial trapping move link battle glitch | Pokémon Tower Pokédex glitch | PP underflow glitches | Recovery move glitch | Rival's effect | See a Ghost without a Silph Scope | Selfdestruct and Substitute glitch | Silph Co. PC Glitch | Slot machine glitch | Stand on a tree | Statue behavior glitch (Red and Blue only) | Super effective move AI flaw (Red and Blue only) | Super Glitch | Surf down glitch | Swift miss glitch | Transform assumption glitch | Transform Empty Move Glitch | Trick Zone | Vending machine purchase glitch | Walk around with only fainted Pokémon (Red and Blue only) | Walking lag glitch | Walk on water through Surf | Walking Pikachu happiness glitch (Yellow only) | Wild appeared! | ZZAZZ Glitch

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Ditto DV manipulation is a glitch in Pokémon Red, Blue, and Yellow that can change the DVs of a wild Ditto to match one of the player's Pokémon after it is caught. It can also be performed on a non-Ditto wild Pokémon that can use Transform, although the Transform assumption glitch means that the Pokémon would become a Ditto anyway.

Summary

Transform can change DVs in battle, but when a transformed Pokémon is caught, its DVs revert to what it had before the last time it successfully used Transform. Therefore, this glitch happens when a wild Pokémon uses Transform successfully twice. This can happen when the Pokémon it transforms into the first time also knows Transform, either naturally or through Mimic. This Pokémon is also the one whose DVs will be copied to the caught Ditto, so to exploit this glitch, the player needs to already have a Pokémon that knows Transform or Mimic and also have the desired DVs.

Applications

Since shininess in Generation II is determined by DVs, this glitch is useful for obtaining a shiny Ditto. For this purpose, the player needs a Pokémon that is already shiny in Generation II (shininess did not exist in Generation I), and knows Transform or Mimic. An easy candidate is the red Gyarados that the player is guaranteed to encounter as an in-game event in Generation II, which can learn Mimic by TM after it is traded to Generation I.