Dynamaxing, the big gameplay mechanic for the recently released Pokemon Sword & Shield, will not be featured in competitive community Smogon OU Singles. The feature was put to a vote and an overwhelming 87% voted against its inclusion in upcoming unofficial Smogon tournaments.
The OU council recognizes that Smogon is a large institution within the realm of competitive Pokemon battling. Additionally, we understand that banning a core mechanic such as Dynamaxing will have a substantial impact on the competitive landscape of this generation throughout our metagames and perhaps other formats. Given this, we would like to use this thread to explain the ban of Dynamax as well as provide any relevant information for the sake of clarity and transparency.Read more here