From Bulbapedia, the community-driven Pokémon encyclopedia.
Mega Energy (Japanese: メガエナジー Mega Energy) is a type of currency introduced in Pokémon GO that is used to temporarily Mega Evolve certain species of Pokémon. Similar to Candy, each type of Mega Energy is specific to one evolutionary line. According to Professor Willow, unlike with Mega Stones, Mega Energies allow a Trainer to Mega Evolve Pokémon without needing a Key Stone.
In Pokémon GO
Each eligible requires a specific amount of Mega Energies to Mega Evolve. After a Pokémon has Mega Evolved for the first time, the cost to Mega Evolve it again into the same form is reduced to 1/5 the original cost. This cost reduction is retained even if the Pokémon is later traded.
For each species, a player can hold a maximum of 2,000* Mega Energies at a time. Any Mega Energies earned beyond this limit will not be received.
List of Mega Energies
Mega Energy is normally obtained by completing Mega Raids, Raid Battles with Mega-Evolved Pokémon as Raid Bosses, which will reward Mega Energies specific to the Raid Boss that was defeated. The amount of Mega Energy rewarded ranges from 50 to 90, depending on how quickly the players completed the Mega Raid.
Mega Energy for various Pokémon may also be obtained for completing certain Field Research tasks.
Beedrill Mega Energy can be obtained through a Special Research event.
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