Are Ultra Beast shiny locked?

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7] After 5 months I caught all shiny Ultra Beasts! : r/ShinyPokemon

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Gen 7] The last shiny Ultra Beast in Ultra Sun is mine. This is my first time using the Pokétch counter app. 417 encounters, and 2 hours, 34 minutes, and 41 seconds

ALL 11 SHINY ULTRA BEASTS 6IV POKEMON SWORD & SHIELD CROWN TUNDRA TRADING NOW