Are shiny legenderies in this game rare? - Questions - The Pokemon

Hello earlier today I was trying to catch Meloetta by resetting my game every time my quick ball does not work so i don’t end up spending a fourtune on balls. On the 3rd or 4th time of this I encountered a shiny meloetta and caught it with a shiny ball. Are shiny legendaries common or do they have increased shiny rates. I tried to google it but couldn’t find an answer in thanks in advance for any reply or answer to this.

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