SUPERWEAPON LOCATIONS

Hexad-Partican (lv.30) - Complete Two Peas in a Pod.
Hexad-Partican (lv.50) - Same, except it's only the blueprints.
Hexad-Partican (lv.60) - Same as lv.50.

Zenith-Cannon (lv.30) - Complete Chapter 12.
Zenith-Cannon (lv.50) - Primordia, near Talon Rock. On a floating island near the northwest side.
Zenith-Cannon (lv.60) - Complete L's final affinity quest.

Zweihand-Q (lv.30) - Complete Chapter 12.
Zweihand-Q (lv.50) - Primordia, Windswept Ridge. Atop the rock ceiling covering the area.
Zweihand-Q (lv.60) - Complete Lin's final affinity quest.

Trident-Anchor (lv.30) - Complete Chapter 12.
Trident-Anchor (lv.50) - NLA Waters. Small island west of the Green Threshold (FN 103). Incidentally, this is also where Sven the Sturdy lives.
Trident-Anchor (lv.60) - Complete the DUEL GUY (I forgot his name)'s final quest. He's in the very back of the Wrothian Stronghold.

Electric-Flood (lv.30) - Complete Chapter 12.
Electric-Flood (lv.50) - Noctilum, halfway up Celestial Ascent.
Electric-Flood (lv.60) - Complete Celica's last affinity quest.

Voltaic-Tusk (lv.30) - Complete Chapter 12.
Voltaic-Tusk (lv.50) - Noctilum, Weeping Whitewood. In the northwest wall, guarded by a Scirpo.
Voltaic-Tusk (lv.60) - Complete Slovity's Revenge (mission after Slovity's Rampage).

Antimatter-R (lv.30) - Complete Chapter 12.
Antimatter-R (lv.50) - Noctilum, Everwhelm Falls. It's in the branches, look for the one that extends farthest past the waterfall.
Antimatter-R (lv.60) - Complete Murderess's final affinity quest.

G-Piledriver (lv.30) - Complete Chapter 12.
G-Piledriver (lv.50) - Noctilum, in the lake where Go-rha the Guardian Diety is. To the immediate right of the arch leading to the sea is a small cave with this inside.
G-Piledriver (lv.60) - Complete Mia's final quest (not her affinity quest).

Dragoon-Lance (lv.30) - Complete Chapter 12.
Dragoon-Lance (lv.50) - Oblivia, Wrothian Stronghold. In the balcony where Vi Sezha is.
Dragoon-Lance (lv.60) - After completing Lend an Ear, go to the Wrothian Stronghold at night and talk to Zo Zinath. His quest gives you the blueprints to this weapon.

Drone-Storm (lv.30) - Complete Chapter 12.
Drone-Storm (lv.50) - Oblivia, in the Beachside Trove. You know the chest.
Drone-Storm (lv.60) - Complete Irina's final affinity quest.

Deus-Crusher (lv.30) - Complete Chapter 12.
Deus-Crusher (lv.50) - Sylvalum, right underneath Anvil Rock Two.
Deus-Crusher (lv.60) - Complete Lionhearted (the affinity quest right outside of O'rrh Sim).

Barrage-Cloak (lv.30) - Complete Chapter 12.
Barrage-Cloak (lv.50) - Sylvalum, outside the Banshee's Cave. Go west until you find one of those purple tree things. Note: requires Biological lv.5.
Barrage-Cloak (lv.60) - Complete Hope's last affinity quest.

Detonation-F (lv.30) - Complete Chapter 12.
Detonation-F (lv.50) - Cauldros, around the rim of Mount M'gando.
Detonation-F (lv.60) - Complete Phog and Frye's last affinity quest.

Megaflame-B (lv.30) - Complete Chapter 12.
Megaflame-B (lv.50) - Cauldros, in the deepest part of the Infernal Ledges. Curiously, this one only needs Mechanical lv. 4 to unlock.
Megaflame-B (lv.60) - Complete Definian Downfall.