What episode does Squirtle evolve d in the Pokémon indigo League?

In the Pokémon Indigo League, Squirtle does not evolve. Throughout the series, Ash's Squirtle remains in its original form, showcasing its skills and loyalty without evolving into Wartortle or Blastoise. The evolution of Pokémon, including Squirtle, is a theme explored in other episodes and series but not specifically in the Indigo League.