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How I got gold in the Emerald Battle Dome:
Starmie - Surf, Psychic, Thunderbolt, Ice Beam
Flygon - Earthquake, Rock Slide, Quick Attack, Rest
Sceptile - Leaf Blade, Dragon Claw, Crunch, Thunderpunch
If you're wondering about Quick Attack, it's there because the AI sometimes likes using stuff like Endure/Flail Pinsir, who will fuck you up if you aren't careful.
Almost always chose Starmie and Flygon, with Sceptile only being used if the opponent had 2 Water types, or a Water/Ground (or I guess Alakazam).
Usually started with Starmie, since it outspeeds and destroys almost everything. In case of the opponent starting out with an Electric type, just switch to Flygon.
Before the last tournament, Sceptile was changed to Shedinja, who was only used in the last battle, since he walls Tucker completely. It was somewhat funny how he kept switching moves randomly while I SDed and destroyed him. Take that!