Azumarill has a glaring weakness to Greninja's Poison-type move Gunk Shot, but if holding a Covert Cloak, Azumarill can avoid being poisoned, and a Water Tera type would even sort out its one weakness in this situation.

Source: https://www.cbr.com/best-scarlet-violet-pokemon-tera-raid-battles/

Azumarill has a glaring weakness to Greninja's Poison-type move Gunk Shot, but if holding a Covert Cloak, Azumarill can avoid being poisoned, and a Water Tera type would even sort out its one weakness in this situation.

Source: https://www.cbr.com/best-scarlet-violet-pokemon-tera-raid-battles/

Once players finish the first step, they must choose between Skarmory, Trevenant, or Azumarill path.

Source: https://gamerant.com/pokemon-go-great-league-greatness-which-path-to-choose-skarmory-trevenant-or-azumarill/