Shadow Hearts

When you beat the game and after the credits, save. Load that save and you will have all the fusions from before to start with.

Once you beat the game, you'll be asked to save, do so, then load that data, you'll start a new game with your old library, and all your old fusions, you'll also be able to compete against your score from last time!

Use the following trick to defeat Seraphic Radiance or any Boss. Let Yuri use Monkey's Paw on himself. The second character should use Gold Hourglass to negate the ring abnormality of the Monkey's Paw effect. The third character should use Moon Swallow so all hits will become critical. On Yuri's turn, morph into Amon or Seraphic Radiance, or any level 3 fusion monster. Use Seventh Key and make sure you hit all Judgment Ring bars, not necessarily on the red (critical) portion. The first hit may even reach 999 if you are lucky.
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First, find the lowest level character on your side of the field. This character should be using items on other characters (good or bad). The highest level character should be your main attacker. The remaining character should be your secondary attacker/item user. Remember, the primary item user and main attacker must stay alive.
Phill.

After you get the "Deathblade, Jiru", from the Calios Mental Hospital, do some acupuncture on the sword's hit area, until level 3. Make sure that you have the following accessories for Keith: Jade Lariat (increases the Hit Area 20%) and Iron Clogs (-15 Agility, but indicator speed is 50% slower). The main purpose of this is to maximize the area and reduce the speed of the indicator so that you can hit it three times, killing any enemies in one turn. You can also equip Coral Lariat instead of Iron Clogs, but the indicator will go faster. If you practice, it will be easy to handle. You can do this if you do not want Keith to be the slowest party member due to the "-15 Agility" penalty of the Iron Clogs. This is an easy way to gain experience, and can also be combined with Yuri wearing a "Mind's Eye".

To easily defeat Hyuga/Seraphic Radiance, you should be level 45 or higher. You also need Amon, Thera Roots, Tea Of The Holy One (x5), Fifth Key (x2 to 4), and Seventh Key(x2 to 4). You really do not need Mana Roots. It would also be better if you have Yuri's Ultimate Weapon, and have it fully upgraded. When the battle begins, fuse to Amon and use Demon Ray on Hyuga. He can be defeated in three to four hits. Do not use the Keys yet. Use Thera Roots when your HP goes down to 200. Make sure to keep your HP above 400; when he fuses to Seraphic Radiance he will drain your HP by 375 to 400 using "Malcto" and it will kill you. When your HP is high, use either Fifth Key or Seventh Key on him. Complete at least three rounds (it does not need to hit the red ones). Again, always make sure your HP is above 400. Also, do not forget to look at your Sanity Points. Do this again until you have defeaedt him. When the battle ends, go back and check the back of the tree for Yuri's ultimate armor.