Are Reshiram and Zekrom shiny in Pokemon Go?

As part of the Season of Heritage, Reshiram, Zekrom and Kyrurem return as Tier 5 Raid Bosses in Pokémon Go. Now that the Season of Mischief is over, we
Are the current Raid Bosses shiny in Pokemon Go? The Tao Trio are back, starting with Reshiram and Zekrom, but can you catch their shiny form?

elymbmx ✨ Shiny 6IV ✨ Kyurem, Reshiram, and Zekrom

Pokémon GO: How to counter Zekrom in Raids

Zekrom v.2 by Xous54 on DeviantArt

Pokemon GO: The Legendary Shiny Reshiram & Zekrom Have Arrived

Shiny Kyurem, Reshiram, Zekrom - Trade 1 mill Algeria

Reshiram Pokédex: stats, moves, evolution & locations

Can Zekrom Be Shiny in 'Pokémon GO'?

elymbmx ✨ Shiny 6IV ✨ Kyurem, Reshiram, and Zekrom

elymbmx Shiny 6IV Kyurem, Reshiram and Zekrom

Pokémon Go Zekrom best moveset, counters, shiny, and weaknesses

Pokémon Go: How To Find (& Catch) Shiny Zekrom, Reshiram, and Kyurem