Breed a female luxray, with a male..
Arbok snubble granbull piloswine mamoswine exploud walrein floatzel hippowdon glaceon or stoutland who knows ice fang.
For to make it learn Ice Fang you have to breed it and pass on the attack.
http://bulbapedia.bulbagarden.net/wiki/Luxray#By_breeding A list of pokemon with Ice fang that can breed the attack to luxray
