Successfully complete the game and wait at the "The End" screen until a new screen appears.
To make easy jewels, go to the rice stand at the top of the market in Nobilia. Buy her rice (3 jewels per bag) until you cannot buy anymore. Then, go to the appraisal stand. Sell her the rice and you will gain about 100 jewels more than you paid to buy the rice. Repeat until you have as many jewels as needed.
After defeating the squid, your characters will be trapped in a cave and will be saved by a man who lowers a basket. After being pulled out, you will learn that dog has changed into a puddle. After thanking the man, got to the well. Crank the handle to pull up a goblin inside the well. The goblin will run away. Later, when trying to cross the bridge, you will have to fight a clone of yourself. A maze will appear after crossing the bridge. The goblin will be in the top right corner of the maze. Talk to him to obtain the Wizard's coin.
Whenever you get the Crush spell from Blimp, buy some ingredients for the spell and exit the cave. Go through the cave near Blimp's cave and you will exit from another cave. You will see a Mad Monk. Level up Crush by casting it on the Mad Monk. When he dies, exit to the west and re-enter to repeatedly kill him. When you run out of ingredients, buy more with the money that you have earned. As the spell gets stronger, target more enemies to gain even more money. Continue this process until Crush is at Level 9:98. Crush will then be strong enough to kill nearly any future Boss in two to four hits.
Use the Spell "Aura" (Magic pearl - Hector) and Cosmopower, then equip the Lasersword and attack the end Boss. This should be very easy since you are now invulnerable (Aura) and your sword powers up to level 3 attack in about two seconds (Cosmopower). Note: The Aura spell can be found in Act 3 after killing the tentacle monster. Go to the city entrance, but do not enter. Then head west to find a place where you can enter the trees. You will reach a chest where the Aura spell can be found.
After you receive the wind walker from Tinker, fly to Nobilia and head towards the castle. Just before you reach the gate where the two guards are standing is a small space between the water and the wall on the right hand side. Go all the way back into the corner and press the action button. You should receive a Call Bead. Keep pressing the action button until you collect as many Call Beads as needed.
When you get the Lance spell, you can keep bombarding any enemy (except Thraxx and Coleoptera's heart) by casting Lance, pressing Y quickly until the magic menu opens again, then using Lance again and repeating. You will be able to kill Bosses quickly if you use this trick with Lance at a high level, and most will not be able to move if you do it fast enough. It is especially effective against Verminator.