0.0001%
Shiny Pokemon appear randomly in the wild. Every encounter, there is approximately a 1/8500 chance that it will be shiny. If you encounter a shiny Pokemon, it is best that you capture it, as it is a very very rare event.
A shiny Riolu is like any other shiny Pokemon in the game, for every Pokemon that you encounter, there is a 1 in 8192 chance that it will be shiny.
1/8192, which is the normal encounter rate for all shiny Pokemon.
The difference is that the Pokemon that have different color (a.k.a the SHINY) Pokemon are very hard to encounter because their is a 1/8192 chance to encounter that Pokemon as a shiny. Their really isn't a difference between them. The only difference is that they are harder to encounter.
You have to encounter them. but it's less than a 1% chance to find one.
Each Pokemon you encounter has a 1 in 8192 chance in being shiny so just keep searching in the tall grass until you find one.
The nature of the Pokemon has absolutely nothing to do with it being shiny or not. Every time you encounter a wild Pokemon, it has a 1 out of 8192 chance of being differnet colored, or shiny; thus being able to encounter one is very rare. Any Pokemon can be shiny, you just have to be lucky enough to find one.
Just like finding regular, non-shiny Pokemon, you have to walk around. There is a small chance that when you encounter the Pokemon it will be shiny. That, or use an action Replay code. Or you could trade someone for one.
Shiny Pokemon are extremely rare. There is a 1 in 8192 chance of a wild Pokemon being shiny. It is based solely on their stats, and there is no easy way to encounter them without cheating. Red Gyarados is the only Pokemon that will always be shiny. If you do have shiny Pokemon, however, it is possible to breed them and have an increased chance of the offspring being shiny. In Crystal, the odd egg has a 50% chance of hatching into a shiny Pokemon.
In Pokemon, there is only a slight chance that you can find a shiny Pokemon. In Pokemon Diamond, Pearl, and Platinum, there were ways that you can increase your chance of encountering shinys. But since catching shinys depends on a random chance event, there is a 0.01220703125% chance of finding one in any encounter in the wild.
Well, it's more like trying to find them. The chance of seeing a shiny Pokemon is 1 in 8,192. It's pretty obvious when you encounter a shiny Pokemon. The Pokemon will be a different color or shade and a 'shiny' (hence the name) animation will play and you can fight it.
There is a 1 in 8192 chance of finding a shiny pokemon. You have to use a Action Replay. No way you can do that without the cheat!