The Odds of Mark Hunting in Pokémon Sword & Shield

Pokémon Sword and Shield introduced another thing to collect in the Pokémon World. Marks are like Ribbons, they appear on the Ribbon tab for a Pokémon, but cannot be earned like a Ribbon can. Instead, Marks appear on any Pokémon caught in the wild. These Marks do not appear on Egg Pokémon or Raid Pokémon.

By completing the Poké Dex in the Isle of Armor, you will get the Mark Charm, which works like the Shiny Charm for Marks!