Why is Groudon shiny in my Pokédex?

I don’t get it, it doesn’t happen with any of my other Pokémon?

Edit: It’s happening for snorlax as well.

Pleaselog inorregisterto add a comment.

Your pokedex only registers the very first Pokemon you receive, of that species. So, if the very first groudon you got was a shiny, then it will register as a shiny. Starters aren’t registered shiny because they’re not shiny when you receive them. Happens to everyone - even me.

Hope I helped! :)

Source: Experience

Just wanted to clear some things so noone is confused. It is possible to see the shiny form of a Pokemon you caught after you got the first of this Pokemon(non-shiny). All you have to do is go in your Pokedex(I´m talking ORAS here, because I don´t know if it works in XY as well) press A for details then go to Form/Cry?(Don´t really now how it is called correctly in English but it´s the first option above Language) then you can cycle through all the different forms of this Pokemon you already caught. When you “select” one of the forms and close the Pokedex and come back later you will see that the form you “selected” is now the default one. There is not really a select-button or something like that just choose the one you want(by pressing left or right till you get to the form you want) and then press B or close the Pokedex. Hopefully I am not to chaotic here and everyone understands what I´m saying.