https://bulbagarden.net/threads/all-over-world-pokemon-shiny-locked.167322/
All over world pokemon shiny locked? | Bulbagarden
As we know in X/Y xnereas yvetal zygrade mewtwo(despite being able to be soft reseted for a shiny before) and yes EVEN SNORLAX ( on the bridge) are shiny...
pokemon shiny lockedall overworld