What is the rarest shiny in Pokemon Go?

When a strange egg snatched in battle from a Team GO Rocket leader wobbles and cracks, this is the Pokémon you want to see.

The rarest shiny Pokémon are those wearing hats, costumes, holiday trinkets or flower crowns.
The 2 rarest costumed shines are Pikachu Libre and Detective Hat Pikachu.
The rarest mythical Pokémon:

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What is the rarest Pokémon shiny? What is the rarest Pokémon shiny? When a strange egg snatched in battle from a Team GO Rocket leader wobbles and cracks, this is the Pokémon you want to see. The rarest shiny Pokémon are those wearing hats, costumes, holiday trinkets or flower crowns. The 2 rarest costumed shines are...
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