What is the difference between hordes?
Diamond: They get more soul-energy in victorious duels and lose less in case of defeat. Moreover they can buy items from the soul-huckster at a cheaper price. (+30% soul-energy when winning duels, 30% less soul-energy when losing) Ruby: They have a bigger chance to hit in physical combat and they deal more damage. (+5% damage, greater chance to hit) Emerald: Their spells have a bigger chance to hit and deal more damage. Can learn spells one level earlier than other hordes. In addition they have more spell points. (+10% spell damage.) Sapphire: They suffer less damage in combat, their HP- and SP-regeneration is quicker and they benefit more from healing effects, too.
