Resistance-Revamped Mechanic build.

Reposted from Leafre.net (heavily abridged), credits to Pete.

 First Job

Level 10: 3 Prototype (3) 1 Gattling Shot (1) 1 Drillhands (1)
Level 11: 3 Prototype (6)
Level 12: 3 Prototype (9)
Level 13: 1 Prototype (10) 2 Gatling Shot (3)
Level 14: 3 Gatling Shot (6)
Level 15: 3 Gatling Shot (9)
Level 16: 1 Gatling Shot (10) 2 Flame Launcher (2)
Level 17: 3 Flame Launcher (5)
Level 18: 3 Flame Launcher (8)
Level 19: 3 Flame Launcher (11)
Level 20: 3 Flame Launcher (14)
Level 21: 3 Flame Launcher (17)
Level 22: 3 Flame Launcher (20)
Level 23: 3 Gatling Shot (13)
Level 24: 2 Gatling Shot (15) 1 Drillhands (2)
Level 25: 3 Drillhands (5)
Level 26: 3 Drillhands (8)
Level 27: 3 Drillhands (11)
Level 28: 3 Drillhands (14)
Level 29: 3 Drillhands (17)
Level 30: 3 Drillhands (20)

 Second Job

HWM = Heavy Weapons Mastery
Level 30: 1 Atomic Hammer (1) 1 HWM (1) 1 Rocket Booster (1)
Level 31: 3 Mechanic Mastery (3)
Level 32: 3 Mechanic Mastery (6)
Level 33: 3 Mechanic Mastery (9)
Level 34: 3 Mechanic Mastery (12)
Level 35: 3 Mechanic Mastery (15)
Level 36: 3 Mechanic Mastery (18)
Level 37: 2 Mechanic Mastery (20) 1 Physical Training (1)
Level 38: 3 Physical Training (4)
Level 39: 3 Physical Training (7)
Level 40: 3 Physical Training (10)
Level 41: 3 Mechanic Rage (3)
Level 42: 3 Mechanic Rage (6)
Level 43: 3 Atomic Hammer (4)
Level 44: 3 Atomic Hammer (7)
Level 45: 3 Atomic Hammer (10)
Level 46: 3 Atomic Hammer (13)
Level 47: 3 Atomic Hammer (16)
Level 48: 3 Atomic Hammer (19)
Level 49: 1 Atomic Hammer (20) 2 HWM (3)
Level 50: 3 HWM (6)
Level 51: 3 HWM (9)
Level 52: 3 HWM (12)
Level 53: 3 HWM (15)
Level 54: 3 HWM (18)
Level 55: 2 HWM (20) 1 Open Portal (1)
Level 56: 1 Open Portal (2) 2 Mechanic Rage (8)
Level 57: 3 Mechanic Rage (11)
Level 58: 3 Perfect Armor (3)
Level 59: 3 Perfect Armor (6)
Level 60: 3 Perfect Armor (9)
Level 61: 3 Perfect Armor (12)
Level 62: 3 Perfect Armor (15)
Level 63: 3 Perfect Armor (18)
Level 64: 2 Perfect Armor (20) 1 Mechanic Rage (12)
Level 65: 3 Mechanic Rage (15)
Level 66: 3 Mechanic Rage (18)
Level 67: 2 Mechanic Rage (20) 1 Open Portal (3)
Level 68: 3 Open Portal (6)
Level 69: 3 Open Portal (9)
Level 70: 1 Open Portal (10) 2 Rocket Booster (3)

 Third Job

Level 70: 1 Punch Launcher (1) 1 Siege (1) 1 Rock 'n Shock (1)
Level 71: 3 Over-tuning (3)
Level 72: 3 Over-tuning (6)
Level 73: 3 Over-tuning (9)
Level 74: 3 Over-tuning (12)
Level 75: 3 Over-tuning (15)
Level 76: 3 Punch launcher (4)
Level 77: 3 Punch Launcher (7)
Level 78: 3 Punch Launcher (10)
Level 79: 3 Punch Launcher (13)
Level 80: 3 Punch Launcher (16)
Level 81: 3 Punch Launcher (19)
Level 82: 1 Punch Launcher (20) 2 Rock 'n Shock (3)
Level 83: 3 Rock 'n Shock (6)
Level 84: 3 Rock 'n Shock (9)
Level 85: 3 Rock 'n Shock (12)
Level 86: 3 Rock 'n Shock (15)
Level 87: 3 Rock 'n Shock (18)
Level 88: 2 Rock 'n Shock (20) 1 Satellite (1)
Level 89: 3 Satellite (4)
Level 90: 3 Satellite (7)
Level 91: 3 Satellite (10)
Level 92: 3 Satellite (13)
Level 93: 2 Satellite (15) 1 Acceleration Bot (1)
Level 94: 3 Acceleration Bot (4)
Level 95: 3 Acceleration Bot (7)
Level 96: 3 Acceleration Bot (10)
Level 97: 3 Satellite (18)
Level 98: 2 Satellite (20) 1 Lucky Dice (1)
Level 99: 3 Lucky Dice (4)
Level 100: 3 Lucky Dice (7)
Level 101: 3 Lucky Dice (10)
Level 102: 3 Lucky Dice (13)
Level 103: 3 Lucky Dice (16)
Level 104: 3 Lucky Dice (19)
Level 105: 1 Lucky Dice (20) 2 Siege Mode (3)
Level 106: 3 Siege Mode (6)
Level 107: 3 Siege Mode (9)
Level 108: 3 Siege Mode (12)
Level 109: 3 Siege Mode (15)
Level 110: 3 Siege Mode (18)
Level 111: 2 Siege Mode (20) 1 Healing Bot (1)
Level 112: 3 Healing Bot (4)
Level 113: 3 Healing Bot (7)
Level 114: 3 Healing Bot (10)
Level 115: 3 Metal Fist Mastery (3)
Level 116: 3 Metal Fist Mastery (6)
Level 117: 3 Metal Fist Mastery (9)
Level 118: 3 Metal Fist Mastery (12)
Level 119: 3 Metal Fist Mastery (15)
Level 120: 3 Metal Fist Mastery (18)

 Fourth Job

Level 120: 1 Extreme Mech (1) 1 Mech Missile Tank (1) 1 Laser Blast (1)
Level 121: 1 Double Lucky Dice (1) 1 Bots n Tots (1) 1 Robot Mastery (1)
Level 122: 1 Satellite Safety (1) 1 Giant Robot SG-88 (1) 1 Double Lucky DIce (2)
Level 123: 3 Double Lucky Dice (5)
Level 124-134: 29 Extreme Mech (30) 1 Laser Blast (2)
Level 135-145: 28 Laser Blast (30) 2 Amplifier Robot AF-11 (2)
Level 146-152: 18 Amplifier Robot AF-11 (20)
Level 153-163: 29 Mech Missile Tank (30) 1 Bots n Tots
Level 164-174: 29 Bots n Tots (30) 1 Robot Mastery (2)
Level 175-179: 13 Robot Mastery (15) 2 Satellite Safety
Level 179-187: 17 Satellite Safety (20) 1 Whatever you want
Level 188-200: Your choice of giant robot or Maple Warrior

For 5-6 months from now when you guys finally get the revamp.