Sol's sword. Junkyard Dog is a Silver-tier weapon with a level cap of 60; the data is the same for both Global and JP (even though global hasn't unlocked level 60 silver-tier yet for other weapons).

Stats by Level

Weapon Skills

• Initial: Wasteland's Roar
  • 15% Crit Chance, 0-50% ATK based on HP Remaining
• Level 15: Crushing Strike
  • 50% BB ATK
• Level 25: Wasteland's Cry
  • 25% Crit Chance, 0-80% ATK based on HP Remaining
  • Replaces Wasteland's Roar
• Level 40: Furious War Cry
  • Add "50% Crit Damage for 3 turns" to BB/SBB
• Level 60: Scorching Gun Flame
  • 100% BB ATK, 30% BC Fill Rate
  • Replaces Crushing Strike

EX Skills

• Level 30: The Power of Fire
  • 30% ATK/DEF/REC when HP > 50%, 50% BB ATK
• Level 60: Flame of Corruption
  • 30% HP/ATK, 50% BB ATK, 50% Crit DMG

BB: Tyrant Rave ver.β

• BB 1:
  • 11 hits 300% AoE ( 100 Flat), 30% Crit Chance for 3 turns, 30% DEF->ATK for 3 turns
  • Available from level 1
• BB 10:
  • 11 hits 400% AoE ( 100 Flat), 60% Crit Chance for 3 turns, 60% DEF->ATK for 3 turns
  • Unlocked at level 20

SBB: Dragon Install

• SBB 1:
  • 70% ATK/DEF/REC for 3 turns, 50 BC fill (self) for 3 turns, 200% BB ATK (self) for 3 turns
  • Unlocked at level 20
• SBB 10:
  • 120% ATK/DEF/REC for 3 turns, 50 BC fill (self) for 3 turns, 250% BB ATK (self) for 3 turns
  • Unlocked at level 47

Junkyard Dog has no UBB. And yes, the names of the BB/SBB match Sol's. Effects are slightly different, though.

In other news, the next map's weapons have been added to global's data (this could've been a while ago and I've only just noticed, but whatever). Their names:

• Twin Daggers -> Dancing Blades
  • BB: Arge Rapido
  • SBB: Thousand-Night Dance
• Hammer -> Thundering Maul
  • BB: Steelbreaker
  • SBB: Demolition Hurricane
• Protag Sword -> Radiant Longsword
  • BB: Eneoscalibur
  • SBB: Bliss Clarent
  • UBB: Hero-King's Sword
• Shusui Axe -> Godslayer Axe
  • BB: Grand Destruction
  • SBB: Earthshaker Wave
  • UBB: Catastrophe Bringer