Primal Reversion is an ancient transformation affecting Pokémon that debuted in Omega Ruby and Alpha Sapphire. In Pokémon GO, Kyogre and Groudon will be able to transform into their Primal forms when enough Primal Energy has been collected by their Trainer. Primal Energy can be earned by:
- Defeating Primal Kyogre or Primal Groudon in Primal Raids
- Completing specific research tasks that award Primal Energy
Primal Kyogre and Primal Groudon will stay in their respective primal forms for eight hours after Primal Reversion is activated, before then returning to their standard form. Once Trainers have had one of their Pokémon undergo Primal Reversion, the Pokédex category for Mega Pokémon will be updated to include entries for these Pokémon.
The more times Kyogre and Groudon revert to their Primal forms, the less Primal Energy that Pokémon will use for future Primal Reversions, and the higher their individual Primal Level will increase. When transformed, Primal Kyogre and Primal Groudon will give their Trainer special bonuses if they are in their party or are acting as their buddy Pokémon, with the degree of these bonuses dependent on their Primal Level. A Pokémon’s Primal Level and the bonuses granted by that level can be viewed in-game by navigating to the Pokémon’s page, and tapping the Primal Level icon.
- When Primal Kyogre is in a Trainer's party, Water-, Electric-, and Bug-type attacks will benefit from attack bonuses in raids.
- When Primal Kyogre is a Trainer's buddy, catching Water-, Electric-, and Bug-type Pokémon will grant you additional XP and Candy.
- When Primal Groudon is in a Trainer's party, Fire-, Grass-, and Ground-type attacks will benefit from attack bonuses in raids.
- When Primal Groudon is a Trainer's buddy, catching Fire-, Grass-, and Ground-type Pokémon will grant you additional XP and Candy.
Primal Raids will make their debut during Pokémon GO Tour: Hoenn during the live event in Las Vegas. before appearing again during Pokémon GO Tour: Hoenn – Global. Primal Raids are similar to normal Raid Battles, with the only real exception being that the Pokémon you challenge will be more powerful than those you may have encountered previously.
As announced back in November, Ticket-holding Trainers in Las Vegas will have additional opportunities to complete Primal Surge Field Research, leading to an improved chance to encounter Primal Groudon or Primal Kyogre. This Field Research will also be available during Pokémon GO Tour: Hoenn – Global.
Primal Kyogre and Primal Groudon caught in Primal Raids during either the live or global event will know special Charged Attacks. Both Primal Kyogre's Origin Pulse attack and Primal Groudon's Precipice Blade attack have 130 Power in Trainer Battles with an Energy cost of 60, and 130 Power in Gyms and Raids with an Energy cost of 100, Duration of 1.7 seconds, and Damage window of 1.4-1.6 seconds.