Shiny Pokémon were introduced in the Generation II games. When a Shiny Pokémon appears in the wild or from its Poké Ball, it is surrounded by a flash of light or stars with a sound effect. In the game, an individual Pokémon is not able to change its shininess. You will never see a regular Pokémon becoming shiny.
A Pokémon will maintain its shiny status and will level up, for example, a shiny Charmander will become a shiny chameleon and Charizard. However, the regular Charmander will remain regular even as a Charizard.
Determining the Shininess of the Pokémon
In Generation II, being shiny is determined by the IVs of the Pokémon. The speed, defense, and Special IVs are all 10. If its attack IV is 2, 3,6,7,10,14, or 15, then the Pokémon is going to be shiny. Usually, if you trade a shiny Pokémon to a Generation I game and then back to Generation II, the shiny Pokémon will maintain its shininess. All the Pokémon needs are to have the IVs requirements for shininess and it will become shiny even in Generation III.
The HP IV is calculated from the other four IVs and it will either be a 0 or 8. Shiny Pokémon are slightly above average in terms of IVs and this should not worry you. The probability of encountering a shiny Pokémon in the wild, as a gift or event in Generation II is 1/8192. For the bred Pokémon, the IVs will be determined partially by their parents. You should expect a special stat of a parent to pass to their children and the defense stat will go to the child of the opposite gender from them.
Therefore this means that a shiny parent will pass the IVs to the child, the child will have a defense IV of 10 and the special IV has ½ probability of being 10. Usually, there is a 1/64 chance that the child is going to be shiny considering the randomly generated attack IV and speed IV. If the parent does not have a Defense IV of 10 or a special IV of either 2 or 10, the breeding mechanics ensure that the child cannot be shiny.
Generation III saw the overhauling of many aspects of the game and the calculation of the Pokémon’s shininess is one of them. From Generation III to V, the result of the personality value has to be less than 8 for the Pokémon to be shiny
When the Pokémon is transported from the Virtual Console to Pokémon Bank, sometimes it can be shiny after.
In generation II, there are in-game shiny Pokémons and any Pokémon has the potential of being shiny. However, you must encounter the red Grayados at the Lake of Rage. The Odd Egg has a high chance of hatching a shiny Pokémon in Pokémon Crystal.
It is not rare to find a shiny Pokémon as long as you know the odds of the stats you need to acquire a shiny Pokémon. With new incoming generations, it is even easier as calculating these odds has become even more efficient.
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