Just like
Max Raid Battles,
Shiny Pokemon are possible in
Dynamax Adventures. However, whether or not a Pokemon from a
Dynamax Adventure can be Shiny is determined right at the end when selecting which Pokemon to keep for yourself. This means that a Pokemon from a Dynamax Adventure can be Shiny for you but not someone else in the same adventure. The odds of finding a Shiny Pokemon in a Dynamax Adventure is 1 in 300 without the Shiny Charm and 1 in 100 with it; these odds cannot be improved further.