Yes, the Sigilyph can be shiny in Pokemon GO. The Pokemon GO Tour: Unova - Los Angeles and New Taipei City events debuted shiny Sigilyph via 10 KM Egg hatch, with shiny odds of 1-in-64.

How to catch the regionally exclusive Gen 5 Pokémon Maractus, Sigilyph and Bouffalant during Go Tour Unova: Global in.

Shiny Sigilyph, Shiny Bouffalant, and Shiny Deerling through various methods. During the two-day event, players will keep track of their progression with the free Tour Pass. This special tour pass ...

Additionally, the event will introduce Shiny Deerling, along with Shiny Maractus, Shiny Sigilyph, and Shiny Bouffalant, all of which will be available in 10 km Eggs.