Mega Evolution was introduced in Pokémon GO on August 27, 2020.

Quick Scoop

The mechanic first arrived in late August 2020, and it was later expanded with more Mega Pokémon over time.

What that means

  • The first rollout happened in 2020.
  • Niantic has continued adding new Mega Evolutions in later events and updates.

TL;DR

Mega Pokémon were introduced in Pokémon GO on August 27, 2020.