Doomtrain
Location: Obtain Solomon's Ring at Tear's Point, collect 6 Remedy+, 6 Steel Pipes and 6 Malboro Tentacles, then use the ring
Element: Poison
Summon: Runaway Train - Poison damage to all enemies plus it casts Meltdown and all negative status effects
Ability AP Prerequisite   Ability AP Prerequisite
Elem-Atk-J - (initially learned) SumMag+10% 40
ST-Atk-J - (initially learned) SumMag+20% 70 SumMag+10%
Elem-Defx4 180 SumMag+30% 140 SumMag+20%
ST-Def-Jx4 180 SumMag+40% 200 SumMag+30%
Magic - (initially learned) GFHP+10% 70
GF - (initially learned) GFHP+20% 140 GFHP+10%
Draw - (initially learned) GFHP+30% 200 GFHP+20%
Item - (initially learned) GFHP+40% 0 GFHP+30%
Darkside 100 Boost 10
Absorb 80 Junk Shop - (initially learned)
Auto-Shell 250 Forbid Med-RF 200
Notes: Not only provides excellent defense abilities, but also the summon dissolves the defenses of most enemies, even bosses.