Play as Bowser and unlock Hammer Bro!!!
First of all, in order to unlock Hammer Bro, you have to beat Challenge Mode with Bowser. To play as Bowser in Challenge Mode, you have to beat SPECIAL difficulty of Challenge Mode. The credits will roll and pop-up should come up saying that you have unlocked Bowser as a Team Captain. Then do Challenge Mode on any difficulty. Then when you finish, you should be able to play as Hammer Bro.
There is a twist when you play as Bowser.
Since Bowser is the BOSS when you play as the other captains (Mario, Peach, Yoshi, DK and Wario), Lakitu will pop up and say that you set up the Challenge and that you have to wait for the challenger, but you don't. Beat the other teams and return to your castle. Once you arrive, Lakitu will pop up again and say that Mario's team is playing in YOUR stadium! They must have snuck in when you where playing the other teams.
Now you have to go and play Mario's team, but it is not the same as when you first played him. The game lasts for 5 innings on Mushroom, Fire Flower and Star levels, and on Special level it lasts for 7 innings.
This time he will have the other teams' players on his team.
When I played him, he had these players:
Mario, Luigi, Peach, Daisy, Yoshi, Birdo, Wario, Waluigi and Diddy Kong. I don't know why he didn't have DK on his team...
The roster maybe the same for you, maybe not.
HOPE I HELPED!!!
Added by: OpOxKiDd Jan 1st 2007, ID#7229