Here's a good team for facing the Elite Four:
Lugia. Make sure Lugia knows the following moves:Aeroblast, psycic, blizzard and recover.
Ho-oh. Make sure Ho-oh knows the following moves: Fireblast, psycic, Earthquake, and recover.
Steelix. Make sure Steelix knows these moves: Wrap, Sandstorm, Irontail, and protect.
Mewtwo. Make sure Mewtwo knows these moves: Psycic, Thunder, Blizzard, and recover
Articuno. Make sure Articuno knows these moves: Ice beam, SkyAttack, hyperbeam and blizzard.
For the last poke'mon select any strong fighting poke'mon, that knows at least one strong fighting attack.
A tip to beat Koga: First send out steelix. Then use sandstorm right away.
Koga's double team attack will not effect sandstorm in away; it will always hit.
The keep using protect and wait for your your enemies to get Knocked out! (remember to use sandstorm whe it subsides)
Added by: Anon , ID#1885