Same way as every other game - you have a very rare chance of encountering one in the wild, or an egg hatching into one. You will know if a Pokemon is shiny because some sparkles will go across the Sprite when you encounter it.
Shiny Stone
No but if you try hard enough you can get a shiny arceus.
It indicates that the pokémon is Shiny!!
You could cheat or soft reset.
most rock and figting but my hm slave is a shiny gyarados
There's an option on AR (Action Replay) where it says Shiny Pokemon or something, I haven't used it in ages!!!Hope this helps
i dont know but go to youtube and seach that you will find it
To get a shiny Pokemon you just simply roam the area where the Pokemon is but the chances are extremely slim so it takes a lot of time to get one, myself have only ever seen 4 shiny Pokemon and i played it for 6 years
By "Crystal" I suppose you're meaning a Shiny Pokémon. Shiny Pokémon are extremely rare. Every time you encounter a wild Pokémon, you have a slim chance of finding a shiny one. It is around 0.01% chance of finding one.
You can't find Registeel in Pokemon Platnium. You just migrate it in Pokemon Ruby, Pokemon Sapphire, and Pokemon Emerald.
you cant catch it in platnium but you can trade it
There is no 'platnium', but you can find it on wild pokemon.