Hidden Spells
When you get all your characters Art moves, including the Hyper and Miracle arts, go to the original tree the character got his/her Ra-Seru to get the Meta/Vahn's spell. Terra/Noa's spell, and Ozma/Gala's spell. Also, when you get Cara's Ra-Seru egg (give the music she gave you to the pianoist in the Jazz Club, then go back to Buma and talk to Cara) give it to Zalan in Jeremi. He will give you an accessory that let's you use the Horn spell, which refills all HP, even if you're dead. However, it costs a whopping 200 mp to cast.
Learning Super Art without a Book of Wind
To learn the Super Javelin for Noa without a book of wind, get in a fight, and then just use Spirit on her until her AP is at 100, go to Attack, Command, and then type in the command for a Rushing Gale and a Sonic Javelin in a combined Art, as said in the game manual you can combine arts in a single attack, and then while you are attacking at the end of the Rushing Gale, it will say, "Super Arts" all in capitals and you will use the Super Javelin, but it is not as powerful as when you learn it from a book, and it will not be on your moves list.
Noa's Moves
Here are some of Noa's moves. Note that some must be learned from books before they can be used.
Acrobatic Blitz - Up, Up, Down, Down
Bird Step - Down, Down, Down, Up
Blizzard Bash - Right, Left, Down, Down
Dolphin Attack - Right, Right, Left, Right,
Frost Breath - Left, Left, Right, Right (Hyper)
Hurricane Kick - Left, Up, Up, Up, Up, Down, Right (Hyper)
Lizard Tail - Right, Up, Down, Up
Mirage Lancer - Right, Right, Up, Up
Noa's Ark - Left, Up, Right, Down, Up, Left, Up, Down, Right (Miracle)
Rushing Gail - Up, Up, Left, Down, Right
Sonic Javelin - Right, Down, Right
Super Javelin - Up, Up, Left, Down, Right, Down, Right (Super)
Super Tempest - Right, Right, Left, Right, Right, Left, Up, Up, Up (Super)
Swan Driver - Down, Up, Up, Up
Tempest Break - Right, Right, Left, Up, Up, Up (Hyper)
Tough Love - Down, Up, Down, Left, Right
Vulture Blade - Left, Left, Right, Left, Right (Hyper)