Question

What are all the games where Shiny Forms can be seen in the Pokedex?

Comments

"Starting in Generation V, Pokémon in the Pokédex will appear Shiny if the first specimen of that Pokémon encountered was Shiny."

Source: https://bulbapedia.bulbagarden.net/wiki/Shiny_Pok%C3%A9mon#In-game_Shiny_Pok.C3.A9mon_4

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You can still see the Shiny form in the formes section of the Pokedex in generations before that.

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Gen four onwards, at least

Not Gen 2.

I’m not sure about Gen 3

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I'm pretty sure Gen 3 but once I get a source I will answer

Answer 1

Kiawe's source is correct. I just checked Diamond (Gen 4) and Ruby (Gen 3) on GBA & DS emulators. It isn't possible until Black/White.

The form difference section will now show Shiny Pokémon as well as
form differences. The last sprite selected will become the one
displayed in the main entry.

_{List (Main Series)}

Black/White
Black 2/White 2
X/Y
Omega Ruby/Alpha Sapphire
Sun/Moon
Ultra Sun/Ultra Moon
Let's Go, Eevee!/Let's Go, Pikachu!
Sword/Shield
Brilliant DIamond/Shining Pearl
Legends: Arceus
Scarlet/Violet

Source

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Up to date as of December 28th, 2023

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Comments

Okay, thanks.