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Shiny Pokémon were introduced as a feature in Pokémon Gold and Silver versions three years after Red and Blue's initial release, and yet shiny hunting in generation 1 is possible. In generation 2, shininess is determined by a Pokémon's DVs, or Determinant Values. Between the two generations, the DV system remains largely unchanged, which means that if the player were to find a Pokémon with the right DV combination in Red, Blue, or Yellow, that Pokémon would become shiny when traded to Gold, Silver, or Crystal. Therefore, shiny hunting in generation 1 can be done by catching Pokémon or resetting until the desired target has the proper stats, and then traded to generation 2 to become shiny properly.
Unfortunately, no. Red, Blue, and Yellow have a faulty way of determining randomness for wild encounters which prevents certain wild DV spreads from being possible, and this excludes all eight possible shiny DV spreads from being given to a wild Pokémon. However, this faulty randomness does not apply to any stationary Pokémon that can be interacted with on the overworld, any Pokémon received as a gift, any Pokémon received from the Game Corner, any Pokémon received in a trade, or specifically wild fishing encounters. Below you can find every naturally huntable shiny Pokémon in generation 1 alongside their generation 2 shiny sprites for easy target-choosing.
Please keep in mind that while these lists include encounters in the Japanese versions of Pokémon Red/Green/Yellow and the Japanese exclusive Blue when applicable, Japanese generation 1 and 2 games CANNOT safely trade with any other language games. This is due to the character sets for the languages being completely incompatible. The games will not stop you from trying, but if you try it can corrupt your save file. Don't go for a Japanese target if you like to keep all your shinies on the same file! If you enjoy transferring your shinies from the Virtual Console releases of generation 1 into the modern generations, that is possible without issue on a Japanese 3DS, and your Japanese shinies will no longer be dangerous once transferred.
The shiny sprite displayed in the table is from Pokémon Gold version. As for the non-shiny sprite, Red/Blue is chosen at default, but the Yellow sprite will be displayed if that Pokémon encounter is only found in Yellow version.Select an encounter type to view:
A Pokémon's DVs are not readily available to the player to see, and instead have to be calculated in reverse from the Pokémon's stats on its summary screen, the base stats of its species, and its level. Unfortunately, this calculation is often not accurate at lower levels and sometimes isn't accurate until around level 50! Additionally, gaining any stat experience can complicate this calculation, making effective and quick encounters seem impossible. However, CPG has a on-site tool to automate this process, that can do the math automatically and figure out if your Pokémon is shiny for you. All you need to use it is a good handful of Rare Candies, especially if the Pokémon you're hunting is at a very low level when obtained. More information on how to use the tool can be found on the tool's page.
If you own a copy of Pokémon Stadium 2 and a Transfer Pak, there is a way to shiny hunt in generation 1 without checking the stats of your target Pokémon. The Game Boy Tower mode in Stadium 2 allows for the Game Boy Pokémon games to be played on the television, and even allows for the generation 1 games to be played at double or triple the speed with the Doduo/Dodrio Game Boy upgrade rewarded to the player after beating Stadium 2's Gym Leader Castle and Stadium Cups in Round 1. Combined with the Pokémon Lab feature, which allows the player to view and organize their Pokémon PC boxes en masse, applicable generation 1 hunts can actually go relatively quickly.
To use this method, simply capture many instances of your target Pokémon in the Game Boy Tower, save in a Pokémon Center, exit to the Pokémon Lab, check your PC boxes for a shiny, release them if none of them are, then rinse and repeat until you find one. This unfortunately does not work for one-time stationary, gift, or trade Pokémon because you must save your game to look at them in the Pokémon Lab. However, this method works great for fishing encounters, and still works pretty well for Game Corner Pokémon, though I think at that point you may as well just check the stats instead.
Generation 1 shiny hunting can be a somewhat complicated and technical subject. If there's anything not mentioned in this guide that you think should be, feel free to send an email to firstname.lastname@example.org with your feedback. It's much appreciated! I want any random person to be able to read the information on this site and try out a generation 1 shiny hunt for the first time. They're just so unique and very worth the setup.