To accomplish the following, you must have the Sword Scroll and the Bomb Scroll. After having both items, you can use your DS stylus to drag the following ability bubbles on top of one another to make new items. The following items can therefore be created:

Fire Bomb - Fire + Bomb
Fire Sword - Fire + Sword
Ice Bomb - Ice + Bomb
Ice Sword - Ice + Sword
Spark Bomb - Thunder + Bomb
Spark Sword - Thunder + Sword