Dewgong is a Water- and Ice-type Pokémon available in 3-star Raids.
It is solo-able for high-level Trainers with teams consisting of top Grass-, Fighting-, or Electric-type counters such as Mega Venusaur, Lucario, Conkeldurr, Roserade, and Zekrom. Lower-level Trainers, or Trainers lacking proper counters, should Raid in larger groups (2-20) to take out the Sea Lion Pokémon.