Other than Lugia, I recommend using Dragonite, Metagross, or Tyranitar due to high stats.
every shadow Pokemon is worth getting in xd, they lead you to getting dragonite the secret last shadow Pokemon.
theres no shadow mightyena on Pokemon xd but there is a shadow pochyena
at the shadow Pokemon factory
Shadow Rush is only a Pokemon XD/Pokemon Colosseum move.
you can only find shadow Pokemon in Pokemon xd
That's only in Pokemon XD
I think Pokemon XD is better bacause you can catch wild and shadow Pokemon
no.
Shadow Lugia.
There is no shadow Groudon in Pokemon XD Gale Of Darkness. If you have some sort of cheating device I'm sure that can be used to get one.
There are three colosseums in Pokemon XD. Pyrite Town (Accessible after Datan tells you he's unable to decipher the data rom) Realgem (Accessible after the first visit to Phenac) Orre (Accessible after beating Master Greevil at Citadark)
for a list of all the shadow Pokemon you can catch and their locations try this site. http://www.serebii.net/xd/Pokemon.shtml ^^