If you'd like to dive deeper into this season, I can help you find: Goh must complete for Project Mew.

in the World Coronation Series during this same timeframe.

Several Larvesta appear, including one that evolves into the Shiny Volcarona during a confrontation with Pokémon hunters. Plot Summary

After being trapped by the hunter, Ash and Goh witness several Larvesta protecting their habitat. In the chaos, a Shiny Larvesta evolves into Shiny Volcarona to protect the others.

Goh successfully collects the falling golden scales after the battle, completing his mission and earning his first token toward becoming a member of Project Mew. Why It Matters