Regulation M-B added 23 new Pokémon and 16 new Mega Evolutions to Pokémon Champions. It did not add a reliable Basculegion answer. That is a significant problem for the format heading into the 2026 World Championships.
Basculegion's dominance comes from Wave Crash — a high-base-power physical Water move that deals recoil to the user, but with Basculegion's offensive stats, the recoil is a price worth paying. Very little in the M-A roster could safely switch into a Wave Crash without risking an OHKO or being left in range of follow-up damage.
With M-B, the expectation was that new Megas or non-Megas would provide the defensive profile needed to wall or outpace Basculegion. That hasn't happened. Even the most hyped new additions run into this problem: Mega Metagross has the Speed and bulk, but Water-type attacks still threaten it significantly. Mega Raichu X sets Electric Terrain which technically boosts Electric moves — but Basculegion is not threatened by Electric Terrain specifically, and Wave Crash is not an Electric move.
The Pokémon that do check Basculegion — primarily bulky Grass and Water types that can absorb a Wave Crash — were already available in M-A and have not meaningfully increased in number or effectiveness.
This does not mean the format is unsolvable. It means team building continues to require a dedicated Basculegion plan rather than assuming the new additions provide coverage. Teams that ignore this will pay for it at Worlds.
If you want to stress-test your team's Water-type matchup, run the type chart and check the speed tiers to see what can actually outspeed and threaten Basculegion before it fires Wave Crash.