Ethan Crossfield 
Pokemon Champions is set for its biggest competitive shake-up yet on September 8. Regulation Set M-C will introduce Mega Absol Z, Mega Lucario Z, Mega Garchomp Z, 26 new Pokemon, additional items, and updated battle rules. The changes arrive after the game served as the VGC title for the 2026 World Championships, giving the update immediate significance for both everyday players and the competitive scene.
What happened in Pokemon Champions
Nintendo of America briefly published details about the September update on August 31 before deleting the post. However, the same additions appeared in a trailer shown during the Worlds 2026 closing ceremony, making the core announcement unlikely to change.
Regulation Set M-C begins at 6 p.m. PT on September 8 and runs until December 1 at 5:59 p.m. PT. The confirmed Mega Z additions are Mega Absol Z, Mega Lucario Z, and Mega Garchomp Z. Rillaboom and Baxcalibur are also confirmed among the 26 new Pokemon, although it remains unclear whether Mega Baxcalibur will be available immediately.
The three revealed Mega Z forms each bring a notable ability. Mega Absol Z gets Sharpness, which increases damage from slicing moves by 50%. Mega Lucario Z has Aura Break, reducing damage from opposing contact moves by 50%, while Mega Garchomp Z receives Levitate and becomes immune to Ground-type attacks.
Why the update matters for the metagame
Pokemon Champions has already shown how quickly its doubles format can change when new Pokemon and items enter the roster. Mega Dragonite winning the 2026 World Championships was especially notable because it was often viewed as one of the weaker Mega Evolutions in the existing metagame. The result underlined how unstable team-building assumptions can be.
Rillaboom could be one of the most influential additions. As a Terrain setter, it introduces new possibilities for Seeds, which activate when their holder enters the field under the matching Terrain. Grassy Seed, for example, can raise Defense in Grassy Terrain. That interaction could improve strategies involving Pokemon such as Sneasler, including combinations built around Unburden or Acrobatics.
The item additions may be just as important as the new Pokemon. Assault Vest would give a 50% Special Defense boost to a Pokemon using only attacking moves. That could make Archaludon more effective outside the rain teams where it is commonly paired with Pokemon such as Mega Dragonite, Basculegion, and Pelipper.
What to watch next
The phrase “updated battle rules” leaves the most important competitive question unanswered. It may simply describe the expanded roster and item pool, but it could also introduce restrictions on team construction. One possibility is a limit on the number of Mega Z Pokemon allowed on a team, although that has not been confirmed.
Players should also watch for the full list of 26 additions, the remaining new abilities, and the exact item changes. The status of Mega Baxcalibur is another unresolved detail. Until those points are clarified, the strongest predictions will remain provisional.
Even without further surprises, Regulation Set M-C is large enough to reset the format. Teams built around the previous environment may need new answers for Terrain, boosted defenses, stronger Mega Evolutions, and unfamiliar combinations.
Key takeaways for players and VGC fans
- Regulation Set M-C launches on September 8 at 6 p.m. PT.
- Mega Absol Z, Mega Lucario Z, and Mega Garchomp Z are confirmed.
- Rillaboom’s Terrain access could revive Seed-based strategies.
- Assault Vest and other new items may create viable roles for overlooked Pokemon.
- Possible Mega Z team restrictions have not been confirmed.
Confirmed Mega Z additions
| Pokemon | Ability | Reported effect |
|---|---|---|
| Mega Absol Z | Sharpness | Boosts slicing-move damage by 50% |
| Mega Lucario Z | Aura Break | Reduces opposing contact-move damage by 50% |
| Mega Garchomp Z | Levitate | Provides immunity to Ground-type attacks |
Expert View
This update could mark the point where Pokemon Champions stops feeling like a stable battle hub and becomes a constantly shifting competitive platform. The timing is ideal for maintaining interest after Worlds 2026, but the unclear rules language means the final team-building restrictions may matter more than the headline Pokemon additions. Either way, players should expect the September format to reward experimentation rather than simply updating existing teams.
