Master Greevil Team
Unlike the Pokemon Colosseum, the final boss battle for XD Gale of Darkness is a lot more challenging because Greevil has all Shadow Pokemon in his party. Its best suggested that you use the Master Ball on Shadow Lugia before you battle him.
He will have a Shadow:
Moltres
Zapdos
Articuno
Exeggutor
Rhydon
Tauros
To be able to capture these Pokemon in one go you need to have a pretty even team that will be able to stand strong against the Shadow Pokemon so that you can catch them. It will also be helpful if you have moves that cause status conditions like Paralysis, Sleep, or Frozen.
Note: On a side not don't be scared if you accidentally defeat any of his shadow Pokemon your first time around, you will be able to go back to him later on to capture the Shadow Pokemon that you missed from your first battle.
If you need more help, we've got more Pokemon XD: Gale of Darkness cheats and also check out all of the answers for this game
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