What Regulation Set M-B Is and Why It Matters
Regulation Set M-B is a major competitive rules update for Pokémon Champions that expands the playable roster, adds new held items, and syncs with a new ranked battles season and battle pass system to redefine how players progress and compete across Nintendo Switch and mobile platforms. Running from mid-June to early September, M-B keeps all Pokémon legal in Regulation Set M-A while adding powerful new contenders such as Mega Sceptile, Mega Blaziken, Mega Swampert, Mega Mawile, and Mega Staraptor. According to GoNintendo, Regulation Set M-B runs from June 16 to September 1 in-game, overlapping with Season M-3 of ranked battles and Battle Pass M-3. Combined with the mobile launch, this timing means both new and returning players are stepping into a reshaped metagame at the same time, with clear goals and rewards tied to the new structure.
New Mega Evolutions and Roster Depth Redefine the Meta
The Pokémon Champions update tied to Regulation Set M-B adds 38 newly usable Pokémon and 16 Mega Evolutions, creating the largest single roster expansion since launch. Player.One reports that these include Mega variants like Mega Barbaracle, Mega Dragalge, Mega Eelektross, Mega Pyroar, Mega Falinks, Mega Malamar, Mega Metagross, Mega Scolipede, and dual forms Mega Raichu X and Mega Raichu Y. GoNintendo lists newcomers such as Vileplume, Scolipede, Scrafty, Dragalge, Grimmsnarl, Overqwil, Annihilape, Gholdengo, and others now recruitable through the in-game Recruit menu, with new lineups available every 22 hours or faster using Victory Points or Quick Coupons. Together, these additions expand roles for weather teams, bulky offense, and disruption-heavy compositions, and they give players far more flexibility when building squads for the evolving ranked battles season under Regulation Set M-B.
Item Pool Expansion and Competitive Strategy Changes
Regulation Set M-B does more than add Pokémon; it answers early player criticism by widening the held item pool in Pokémon Champions. The update introduces 15 new items, including staples like Life Orb, Muscle Band, Wise Glasses, and Light Clay, as well as Big Root, Metronome, Wide Lens, Zoom Lens, and multiple weather rocks such as Heat Rock, Damp Rock, Icy Rock, and Smooth Rock. Items like Iron Ball and Shed Shell further tweak movement and switching options, giving defensive and stall strategies new tools. Player.One notes this is the first major ruleset update since launch, making the item overhaul a key pillar of the patch. With stronger item choices supporting the 38 new Pokémon, Regulation Set M-B encourages more specialized builds and sharper decision-making, especially in higher ranked tiers where small stat boosts or extra turns of weather can decide a match.
Ranked Battles Season M-3 and the New Battle Pass System
A new ranked battles season and battle pass system sit at the center of progression in the Regulation Set M-B era. GoNintendo states that Ranked Battles Season M-3 runs from June 16 to July 7, with the Champion Tier and the top Master Ball ranks opening one week into the season. Players earn in-game rewards based on their rank or placement, and Season Points from ranked battles and competitions raise Battle Pass levels. Battle Pass M-3, available over the same dates, offers Starmie, its Mega Stone Starminite, trainer icons, VP, Quick Coupons, Teammate Tickets, and Training Tickets on the standard track. The Premium Battle Pass adds Eelektross and Metagross plus their Mega Stones, Eelektrossite and Metagrossite, along with the Canari Outfit Set and more tickets. This layered structure gives casual players attainable rewards while giving competitive players reasons to keep grinding matches.
Mobile Launch, Free Raichu, and Accessibility for New Players
The Regulation Set M-B update arrives alongside the mobile release of Pokémon Champions on iOS and Android, unifying Nintendo Switch and mobile players in the same reshaped ecosystem. Player.One notes that the mobile launch drops two months after the initial Switch debut and is paired with a generous login bonus: all players can claim a Raichu and a Mega Stone, either Raichunite X or Raichunite Y, to evolve it into a Mega Raichu form. This reward is available from June 17 to September 1 via the in-game mailbox on both platforms. The overlapping timing of the mobile launch, Regulation Set M-B’s run, and Season M-3 gives newcomers a clean entry point, as veterans are adapting to new Pokémon and items at the same time. The result is a shared learning curve that supports both casual experimentation and high-level competitive play.
