There are 5 categories of Ballman, which are differentiated by the number of base skill points allocated to them.
A Ballman can change categories as soon as he reaches the basic skills of the higher level Ballman ⚡️.
A Rookie Ballman can thus become a Challenger as soon as he reaches 220 skill points, further become an Epic, then Champion.
An exception is made for the Legend Ballmen, which are and will remain 6200 NFTs in total.
No new Legend Ballman players will ever be created: the only way to get one is to buy on OpenSea.