You can get all the items you need for the lionheart at the start of the game, you don't need the Weapons Mon to know them if you played the game before ;)
Also, I have checked up my save and I was a bit further down the game, sorry :P I'm on the Galbadia continent now, just got the Siren GF card.
To get the Lionheart at this point in the game you'll need to do this:
- Adamantite rare drop from the Adamantoise starting at LV. 30
- Dragon Fang rare drop from the T-Rexaur's from LV. 14 - 30
- Card Mod 10 Elnoyle cards to get an Energy Crystal which can be Ammo Mod to Pulse Ammo
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
