Gigantamax Rillaboom Weakness in Pokémon GO: August 1 Max Battle Guide

Pokémon GO has confirmed Gigantamax Rillaboom Max Battle Day for Saturday, August 1, 2026, from 2:00 p.m. to 5:00 p.m. local time. Gigantamax Rillaboom will appear in six-star Max Battles, and the official announcement says Trainers may encounter a Shiny Gigantamax Rillaboom for the first time if they are lucky. Read the official event announcement.

This guide answers the type-chart part of searches such as “Gigantamax Rillaboom weakness.” It keeps confirmed Pokémon GO event details separate from Type Matchup's standard type-chart planning, without assuming a moveset, a counter lineup, damage values, or a guaranteed Max Battle result.

Official facts vs. Type Matchup planning

Officially confirmed: The event runs August 1 from 2:00 p.m. to 5:00 p.m. local time. Gigantamax Rillaboom is the featured six-star Max Battle Pokémon. Pokémon GO also lists a higher Max Particle limit, more active Power Spots, and 8× Max Particles from Power Spots during the event.

Type Matchup planning: Rillaboom is listed as a Grass-type Pokémon in the official Pokédex. The weakness notes below apply the standard type chart to that typing. Pokémon GO's live moves, battle values, Max Moves, battle mechanics, and your group can all affect the practical outcome. The official event announcement does not identify a best counter team, moveset, damage breakpoint, or minimum group size.

What is Gigantamax Rillaboom weak to?

For the standard Grass-type matchup, start by checking these attacking types:

• Fire: super effective against Grass.
• Ice: super effective against Grass.
• Poison: super effective against Grass.
• Flying: super effective against Grass.
• Bug: super effective against Grass.
• Water, Electric, Grass, and Ground: are resisted by Grass in the standard type chart, so they are not the type advantage to prioritize from a type-only perspective.

Use the complete Grass type guide to see the defensive matchup. You can compare a possible attacker in the type matchup calculator, then review Fire, Ice, Flying, Bug, or Poison coverage before committing resources.

August 1 Gigantamax Rillaboom checklist

Pokémon GO says every Power Spot will host Gigantamax Battles during the event, while Power Spots will refresh more frequently and extra Power Spots will be active. The event's official bonuses include a Max Particle collection limit of 1,600, plus 8× Max Particles from Power Spots.

For a type-focused plan:

1. Confirm the local event time in Pokémon GO: August 1, 2:00 p.m. to 5:00 p.m.
2. Begin with a Fire, Ice, Poison, Flying, or Bug matchup check, then verify live moves and Max Battle mechanics.
3. Use the event's stated Power Spot bonuses to prepare your Max Battle attempts.
4. Compare the rest of your team in the team weakness calculator, rather than treating a standard-chart advantage as a complete battle plan.

What this guide does not claim

Community posts can show that players are looking for Max Battle preparation, but they do not establish event facts. This guide does not treat predictions, data mines, claims about optimal teams, soloability, Shiny odds, or encounter results as confirmed. Those points are not stated in Pokémon GO's official event announcement or depend on the live game.

Gigantamax Rillaboom weakness FAQ

When is Gigantamax Rillaboom Max Battle Day in Pokémon GO?

Pokémon GO schedules Gigantamax Rillaboom Max Battle Day for Saturday, August 1, 2026, from 2:00 p.m. to 5:00 p.m. local time.

What is Gigantamax Rillaboom weak to by type?

Rillaboom is Grass-type. In the standard type chart, Fire, Ice, Poison, Flying, and Bug attacks are super effective against Grass. Pokémon GO's live moves, battle values, and Max Battle mechanics still determine the practical result.

Can Gigantamax Rillaboom be Shiny in Pokémon GO?

Yes. The official event announcement says that Trainers may encounter Shiny Gigantamax Rillaboom for the first time in Pokémon GO if they are lucky.

Does the official announcement confirm the best Gigantamax Rillaboom counters?

No. The announcement confirms the event schedule, featured Max Battle, and bonuses, but it does not name a best counter lineup, moveset, damage breakpoints, Shiny odds, or a minimum group size.