I think Each Bromon should come with a special move which can come with several advantages depending on the type of bromon. Example a cybrrr types special move could be a firewall, which means it puts up a sort of flame shield and each time the opponent attacks it takes some amount of damage, or for a wildlife type bromon, “Herbal Reconstruction” which would heal the bromon by a certain amount.
Note: A bromon can also have multiple special moves depending on the rarity.
These moves should be like game tippers, and should have a charge up bar which fills up by acquiring wins with that bromon. So Maybe some weaker special moves could require 3-5 wins meanwhile some more stronger specials could take upto 15 wins.