Save the Queen

Save the Queen has been Donald's ultimate weapon throughout the Kingdom Hearts series, with changing way to obtain it with each game. Goofy has a similarly named weapon, the Save the King.

Kingdom Hearts
This weapon is obtained by winning the Hades Cup using only Sora (this mode is unlocked after winning the Hades Cup for the first time).

Kingdom Hearts stats
 * Description: A staff of immense magical and physical power.
 * Attack power: 9
 * MP effect: Raises max MP by 2

Kingdom Hearts II
This staff is obtained via synthesis. The staff requires Dense crystals, gems, stones, shards, and orichalcum. There is another version of the weapon called Save the Queen + which can be made if Serenity Crystal is added on, although there is no difference in strength it gives Donald the MP Hastega ability.