Beat SSE. Then go to solo then stadium and it should be on the right.
you have to beat the subspace emisary
You have to beat every boss in boss mode with fox and then defeat wolf!
Yes, he is the final boss in the SUper Smash Bros Brawl story mode, but he is not a playable character.
To unlock Boss Battle Mode which is located in Stadium in Solo Mode you have to beat the Subspace Emissary.
A boss in the Subspace Emissary (Adventure Mode in Super Smash Bros. Brawl)
You can beat the subspace emissary and redo the ruins stage, you can fight 450 brawl matches in group mode or, you can beat boss battle mode after completing the subspace emissary with fox.
I am pretty sure you can only face him in boss battle mode. sorry.
for the trophy just beat boss battles on easy mode
by telling them that their house is sold to anther family and they will get really mad then u will be fired.
He will appear right before you get to the final boss fight.
All bosses can be battled either in the subspace emissary or boss battle mode.
After beating the subspace emissary you will unlock a boss battles mode go under Solo and Stadium then choose the boss battles mode in this mode you must face off with all 10 bosses one by one you can choose to use a heart container once your weak.