Grookey Community Day 2026: How Rillaboom’s “Drum Beating” & Frenzy Plant Will Redefine the Grass Meta 2. Brainx Perspective At Brainx, we believe the January 2026 Community Day is not just another starter event—it marks a pivotal shift in the Grass-type hierarchy. The introduction of Rillaboom’s signature move, Drum Beating, alongside the community-favorite Frenzy Plant, […]