In-game, Zekrom, Reshiram, and Victini can't be caught shiny. Sprites for them still exist so hackers can get them, but they are programmed so they can never be shiny.
No- every pokemon you encounter has about a 1/8000 chance of being shiny, even legendaries. If you want a shiny pokemon, you can also breed two pokemon from different areas (US and Japan for example) to increase the chance of the bred pokemon being shiny to about 1/2000.
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In-game, Zekrom, Reshiram, and Victini can't be caught shiny. Sprites for them still exist so hackers can get them, but they are programmed so they can never be shiny.
No- every pokemon you encounter has about a 1/8000 chance of being shiny, even legendaries. If you want a shiny pokemon, you can also breed two pokemon from different areas (US and Japan for example) to increase the chance of the bred pokemon being shiny to about 1/2000.
No, every Pokemon can be shiny. Though with a very slim chance of it being shiny.