A Mega is a temporary second form. It keeps the same moves and the same Candy, but swaps in a much bigger stat line, and sometimes a different typing. 58 Pokémon have one, across 61 forms. Charizard, Mewtwo and Raichu get two apiece, an X and a Y, and Groudon and Kyogre get a Primal form instead.

The biggest attack jumps

Attack is what decides raid damage, so this is the shortlist worth the energy.

The ones that change type

Most Megas keep their typing. These 11 do not, which changes both what they resist and what they hit hard.

Best Mega attackers

Ranked the same way as the tier list: highest-damage moveset at level 40 with a perfect attack stat, measured against a neutral target.

Getting the energy

Mega Energy comes from raids, and 107 Pokémon also earn it by walking as your buddy. Each species page lists what it costs to build, including its buddy distance.

Stat lines and typings are read from the game's own data files.

Questions people ask

What is Mega Evolution in Pokémon GO?

A temporary second form. The Pokémon keeps its moves and its Candy, but swaps in a much bigger stat line, and sometimes a different typing. It reverts on its own, and Mega Evolving the same species again gets cheaper.

How many Pokémon can Mega Evolve in Pokémon GO?

58 species, across 61 forms, counted from the game's own data files rather than a list. Charizard, Mewtwo and Raichu have two apiece, an X and a Y, and Groudon and Kyogre have a Primal form instead.

Which Mega is the best attacker in Pokémon GO?

Mega Mewtwo Y, at 23.7 DPS with Confusion and Psystrike. That is level 40 with a perfect attack stat against a neutral target, the same measurement as the tier list.

Which Mega gains the most Attack?

Mega Diancie, from 190 base attack to 342, a gain of 152. Attack is what decides raid damage, so the attack jump is the number worth comparing.

Do Mega Evolutions change type?

Most keep their typing. 11 of the 61 forms do not, which changes both what they resist and what they hit hard. The full before-and-after list is on this page.

How do you get Mega Energy in Pokémon GO?

From raids against that Pokémon, and 107 Pokémon also earn it by walking as your buddy. How much a raid gives, and the Mega Level system, are not in the game's data files, so this site does not quote numbers for them.

Is Mega Evolution worth it?

For raids, on the forms at the top of the attack table: a Mega also boosts everyone else's damage of its types in the same raid. Outside a raid it changes nothing you keep, because the form reverts.