I dont have the game but I think you have to battle the Boss pokemon.
it is in stadium in solo to unlock beat the subspace emissary
Beat SSE. Then go to solo then stadium and it should be on the right.
Actually that only works on regular pokemon if the boss pad is shiny its a legendary you automatically get it once you beat it a regular boss you get lucky
you bet the boss in the last colloseum
When you beat the final boss of the game, you get a list of all the shadow Pokemon and where you can find them.
To unlock Boss Battle Mode which is located in Stadium in Solo Mode you have to beat the Subspace Emissary.
this makes no sense
You get it after you beat team galactic boss Cyrus.
How is this a Pokemon question? Beat boss battles with Fox or Falco and beat wolf.
use multi type Pokemon
when you free the 3 legendarys and beat the boss hope this helped