The "Create a Dream Team" mode gives you 150 stat points to distribute among your team. There seem to be some light RPG elements involved as well, as you can shop at one of the stores from River City Ransom, which probably ups some of those stats. You can also change the appearance of your team members.
In addition, the special team attacks actually temporarily change the team's stats rather than executing a large attack. You can boost your team's catching ability, speed, and such. Now we just need someone to change Brawlers' "American release date" stat.