There are elders in the following places:
Realm 1:
Elder 1 is in Dragon Village, shows how to Horn Dive
Elder 2 is in Crocovile Swamp, shows how to Pole Spin
Realm 2:
Elder 3 is in Cloudy Domain, showing how to Wing Shield
Realm 3:
Elder 4 is in Ice Citadel, shows how to Wall Kick
P.S Does anyone know a cheat to get through the 95 Light Gem area in Frostbite Village, without having 95 light gems?