Hades tried to use Zack to turn Terra to the darkness.
Hades tried to use Cloud to defeat Hercules. He was also part of Maleficent's Council, sending waves of Heartless at Sora and his friends in the various tournaments held in the Olympus Coliseum as well as monsters like Cerberus and two of the Titans.
Kingdom Hearts II
Hades worked together with Pete, trying to turn Hercules into a Heartless and resurrecting Auron to defeat him. He also sent the mighty Hydra to destroy the Coliseum.
Kingdom Hearts II ½
With all of his schemes against Hercules being thwarted by Sora, Donald and Goofy, Hades has decided to go after them now. Like Pete and Maleficent, he travels from world to world, sending Heartless in his wake and striking alliances with local villains.