The hunt for a Ditto in is one of patience, luck, and travel. Dittos don't appear like most Pokémon. In fact, when you're out walking, you won't see a single Ditto. Dittos disguise themselves as a different set of Pokémon every month. If you're lucky, one of these Pokémon will transform into a Ditto after capture.
Shiny Dittos are even rarer than their regular counterparts. If you catch a shiny Pokémon, it is guaranteed to not be a Ditto. Shiny Dittos have the same disguises as regular Dittos. The shiny spawn rates for a Ditto are about equal to those of rare spawns. There are eight different Pokémon that could secretly be Ditto.
Ditto's disguises are spread between generations 1 through 6, with two Pokémon in Generation 1 and two in Generation 5. Nintendo last updated Ditto's disguise list during the March 2023 Let's GO/Team GO Rocket Takeover. Each copy behaves under the same rules as a real Pokémon of its type, despite being a Ditto.
The two Generation 1 Pokémon that Ditto likes to disguise itself as are Diglett and Grimer. As Generation 1 Pokémon, both of these are common in the wild and easy to track. Diglett is the safer bet of the pair, as it loves to spawn in wide-open spaces. This makes it easy for more players to catch Digletts and maybe find their first Ditto.
Snubbull represents Generation 2 in the disguise line-up and is the only Fairy-type Pokémon on the list. Snubbull's followed up by Generation 3's Corphish, who got an upgrade in September 2023. Corphish now has Razor Shell in its move collection. If bulldogs and crabs aren't your style, you can look for a Starly, Ditto's Generation 4 disguise.
Roggenrola and Tympole are both Generation 5 Pokémon and more disguise options for Ditto. Roggenrola is usually
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