I've beaten the elite 4 only one time and my team is:
Relicanth lvl 42*
Rock tomb
Yawn
Take down
Mud sport
Jirachi lvl 48 (OT NZ)
Zen headbutt
Confusion
Psychic
Draco meteor
Ho-Ho lvl 48**
Extrasensory
Sunny day
Fire blast
Sacred fire
Feraligatr lvl 49
Ice fang
Crunch
Waterfall
Surf
Lugia...