The Summon menu was given its own space in the Command Menu in Kingdom Hearts II because of the inclusion of a second menu that could be accessed during battle. In addition, Kingdom Hearts II summons no longer require MP to be summoned; they now use the Drive Gauge to count down their time instead, and again the player must have two friends in battle in order to perform a summon.
Charms[]
Sora will acquire the Baseball Charm after Merlin explains Pooh's book to him in Hollow Bastion. Upon acquiring the Baseball Charm, Sora gains the ability to summon Chicken Little. Obtained after Sora's first visit to Agrabah. Upon acquiring the Lamp Charm, Sora gains the ability to summon Genie.
The Ukulele Charm is in a chest in Ansem's Study during the second visit to Hollow Bastion. Upon acquiring it, Sora gains the ability to summon Stitch. Sora can find the Feather Charm in a chest in the Ship Graveyard: Interceptor's Hold during his second visit to Port Royal. Upon acquiring the Feather Charm, Sora gains the ability to summon Peter Pan and Tinker Bell. So far, this is the only Summon Charm that summons two characters, instead of one.
Leveling Up Summons[]
Summons in Kingdom Hearts II draw their power from a Summon Gauge, which, in turn, draws from the Drive Gauge. The Summon Gauge can be leveled up, allowing the Summon to remain with Sora for a longer period of time and increasing the Summon's magic skills. One point of Experience is gained for every point of the gauge expended while the Summon is on the field.
A simple way to level the Summon Gauge is by finding a save point, calling on a Summon, and then waiting as time whittles down the gauge. When the gauge is almost at an end, jumping to the World Map will then reset the gauge to MAX. Another good way to refill an empty or incomplete Gauge is to enter a Tournament in the Underdrome, and then immediately quit. This will also refill the Gauge to MAX, allowing a new Summon.
A much faster way to level, however, is to call a Summon to the field and then find enemies to fight. Closely watch the Summon Gauge, and attack enemies the moment the Gauge drops down a level. Each time you land an attack, the gauge will be boosted back up a little bit, so by attacking at the very moment the Gauge drops a level, that level will be regained, only to drop back down again. Using this method expends the time of the summon and grants extra leveling points.
An alternate method that has less potential, but is much easier, is to utilize the Drive orbs in the Checkpoint area of The Land of Dragons. Begin by clearing the area of heartless, then summon Stitch and use fire to break the carts around the area that contain drive orbs. Once cleared, move one zone away and then come back, allowing the items to respawn, but not the heartless. This method only works in Kingdom Hearts II and not Kingdom Hearts II Final Mix, as the items do not respawn this easily in the latter.
Another fast method can be deployed near the end of the game, immediately after The World That Never Was has been unlocked. Starting in the Alley to Between, travel out to Fragment Crossing and run forward to trigger the heartless. Run back to stand just before the entrance to the Alley and summon Chicken Little. As fast as possible, activate the FPS Mode limit, and then immediately press 
to bring the limit to an end. Repeat this same action with FPS until the gauges have almost run out. As FPS uses two gauges every activation, this is a very fast way to run the Summon down. When your gauge is at 0 or 1, depending on your Summon level, return to the Alley to Between to restore the gauges to MAX.
Kingdom Hearts II Final Mix introduces an extraordinarily effective method to leveling up Summons with the addition of Mushroom XIII. Mushroom No. V, located in the Treasure Room in Agrabah, allows Sora to freely attack it as a stationary target. Simply have a summon out and proceed to apply the aforementioned method of attacking when a gauge is about to run out, watching to make sure that No. V is not defeated if Sora is too high of a level, and experience will be gained easily.
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