Beating Gigantamax Rillaboom in Pokémon GO: How many Trainers, hundo CP and more

Gigantamax Battles are back in Pokémon GO this weekend. We're getting the Pokémon GO debut of Gigantamax Rillabnoom on Saturday, May 31 and Sunday, June 1. This Pokémon will be appearing in special six-star Max Battles from 6 a.m. until 9 p.m local time.

The issue is, these battles are incredibly hard to take down. Gigantamax Pokémon are incredibly powerful, and you will need a lot of help to win one of these Max Battles. So, you'll want to be prepared.

Here's everything you need to know before you battle Gigantamax Rillaboom in Pokémon GO:

Previously, the huge number of Trainers needed to win Gigantamax Battles in Pokémon GO caused big issues for small or rural communities. However, Pokémon GO recently made a huge change to Max Battles, allowing Trainers to join them remotely. That will make it a lot easier to get the Trainers you need to win this battle.

The maximum number of Trainers is 40 for a Max Battle and it will take upwards of 25 until you find this Max Battle "comfortable" based on previous experience.

The number of Trainers you need in order to win Gigantamax Battles has a bit more give and take than Raids in Pokémon GO. This is because of two factors.

The first is the relatively small number of Pokémon we have avaliable in the Max system. There is a huge variance in what people have avaliable to them, with some Trainers investing a lot into Dynamax/Gigantamax Pokémon and others not having strong options at all. Sometimes, we don't even have Pokémon that act as very good counters. This is improving every time new Pokémon are released.

The second is the existence of Max Mushrooms in Pokémon GO. These are pretty expensive, however they are also very powerful. They double the power of attacks from Trainers to have one active. That essentially means one Trainer counts as two.

You can absolutely win this Gigantamax Rillaboom battle without using any Max Mushrooms. That said, if you do have some Trainers using them it will reduce the amount of Trainers you need to win this Battle, so they might be useful for smaller communities - or those simply in a rush!

Gigantamax Rillaboom is a Grass-type Pokémon and has five weaknesses in Pokémon GO, that gives it a weakness to Bug, Fire, Flying, Ice and Poison-type attacks.

As a result, the best Gigantamax Rillaboom counters are:

There has been a slow and steady release of good Fire-types into the Max Battle system. The absolute best option is Gigantamax Charizard, but Entei, Cinderace and Moltres (all Dynamax) will be very effective too.

Here is the all important hundo CP number to keep your eye out for after beating Gigantamax Rillaboom:

No, Gigantamax Rillaboom cannot be shiny. This is the first time in Pokémon GO that we have a Gigantamax Pokémon that cannot be shiny at all. Grookey hasn't had a shiny debut yet, and that is seemingly being saved for a Community Day in 2026.

You absolutely need to be coordinated to win this Gigantamax Rillaboom Max Battle in Pokémon GO. Get onto Campfire, see if you have a local Community Ambassador or any other Trainers nearby. These events might come with a check-in reward that gives you extra Max Particles.

Then, in battle, you'll need to keep coordinated too. Have some Trainers use shields and healing each turn, and others attack. Don't forget you can also now join remotely, with websites and Discords avaliable to coordinate.

Additionally, make sure you have good counters (if possible) and also reserve your best Pokémon for the end of the Battle. The Max Meter will charge faster at the end of the Battle. This is because once all your Pokémon are knocked out, you can stay involved in the Raid by cheering. Cheering helps the Max Meter charge faster. So, if you don't have the best counters you can still contribute to your team's success. With teamwork, everyone can get Gigantamax Rillaboom in Pokémon GO.

Finally, make sure to save up your Max Particles on Friday, May 30. If you collect the daily limit on Friday, you can then collect another 1600 for free on Saturday, and again on Sunday. This will let you do at least 6 Max Battles without using any Max Particle packs.

In addition you can save particles from the GO Pass if you haven't collected them yet - and this will not count towards your daily limit.

Good luck taking on Gigantamax Rillaboom in Pokémon GO, Trainer. Stay tuned to esports.gg for the latest esports news and more Pokémon GO guides.