Poison Tera-type Greninja has been shown to be the next seven-Star Tera Raid Event in Pokémon Scarlet and Violet.
The Tera-type mechanic in Pokémon Scarlet and Violet allows one Pokémon per battle the ability to Terastallize, changing their type entirely. This can potentially be a game-changing component of a battle as it is possible to remove a Pokémon's weakness by changing its type, or increasing the damage the Pokémon can do from its moves of the same type.
Pokémon Scarlet & Violet: How to Play Greninja 7-Star Tera Raid Battle
The event starts on Jan. 27 and will be available until Jan. 29, if players miss the first three-day window, the event will be resurging once more on Feb. 10 to Feb. 12 to account for this.
To access this event once it starts, all players will need to do is boot up Pokémon Scarlet or Violet and go to the Mystery Gift menu, then selecting the most recent Poké Portal News option.
Players can challenge this event Pokémon either with friends or with other NPCs for the opportunity to catch the special Greninja. Players will not be able to find Greninja in the wild in Paldea, and further, will not be able to naturally obtain one with a Poison/Tera-type without collecting Poison Tera Shards.
Being a seven-star Tera Raid, the battle to acquire this Greninja will not be easy, but once caught, players will witness the strength of their newly received Pokémon!