Before you start a raid or a Max Battle, you can activate select Adventure Effects from the lobby. Zacian’s Behemoth Blade and Zamazenta’s Behemoth Bash are among them, so your group can get an edge in Max Battles.
The change arrives with the Into the Wild event, from Monday, November 9, at 10:00 a.m. to November 13 at 8:00 p.m. local time, and it stays afterwards. Ticket-holding Trainers at the Pokémon GO Wild Area events in Sendai and Mexico City get early access.
The full event is covered in our post on Pokémon GO Wild Area 2026, and the source is the official announcement.