LION HEART:
Of all gun blades (a sword-gun weapon), the finest model is Lion Heart. 
It requires rare items to be remodeled to its highest quality.

Items needed for remodeling:
Adamantine    = 1
Dragon Fang   = 4
Pulse Ammo    = 12

Where to find:
Adamantine (Long horn island some where north west)- defeat Adamantoise 
or Change Minotaur card into item.
Dragon Fang (Island closest to hell and Shumi tribe area)- From Blue Dragon 
w/RARE ITEM ability receive as a battle prize or w/LVL DOWN ability from 
Tonberry Level him down between 1-10 and receive it as a battle prize.

Pulse Ammo (Lunatic Pandora)- Elnoyle w/LVL UP ability from Tonberry level him 
up 50 to 60 and receive it as a prize w/RARE ITEM ability receive Energy Crystal 
and then change it to a 12 Pulse Ammo, or change Lazer Cannon 5 
Pulse Ammo/Power Generator 20 Pulse Ammo.