Great Combination Attacks
Try having two Pokemon like Tyranitar with Rock slide and Vaporeon with Blizzard. Both of those moves can hit both of your opponents and can have an advantage for you. Try another Pokemon like Donphan with Earthquake and another Pokemon that can LEVITATE and not be hit by Donphan's Earthquake. Try different combinations that you'll be okay with and you'll probably have an 80-90% chance of not losing with the "COMBO" team.
We have more cheats and tips for this game here, Pokemon XD: Gale of Darkness cheats
Comments for this hint