Try to be a little more specific on which Heartless. There's too many for each item.
The heartless that you fight drop different types of items that you can use for item synthesis.
I suggest using this website: http://db.gamefaqs.com/console/ps2/file/kingdom_hearts_ii_bestiary.txt
You can buy them from the shop or certain Heartless would drop them.
The following heartless drop the dark shard: Shadow (all worlds) Soldier (all worlds) As far as i know, none of the nobodies drop it
Frost Stones have a 8% drop rate from Aeroplane Heartless and a 12% drop rate from Hot Rod Heartless, both of which can be found in the world Timeless River.
gales can be dropped by invisibles after you defeat them, invisibles only drop items in the End of the World
Defeat the heartless and collect the orbs they drop. When the bar is filled, go up to a terminal and use the reaction command. (triangle button)
well in end of the world invisibles (big heartless that fly around) and angel stars (gold heartless that have feathers on their head) will drop them if defeated make sure you have lucky strike equipped to the whole team it makes it a lot seaier to find it
There wont be one There is Kingdom Hearts Birth By Sleep and there is going to be Kingdom Hearts Dream Drop Distance
Kingdom Hearts Dream Drop Distance is coming out on July 31, 2012.
Kingdom Hearts 3D is a Nintendo 3DS title. The full title is : Kingdom Hearts 3D - Dream Drop Distance
Yes, all Kingdom Hearts games are RPGs.