More than a Game
Oddly, I've never had any troubles with Tronzor.
Now, on to your problem. Do you have a character page you can let us look at? Are you a WarpGuardian? If not, things'll be a bit tougher, but it should still be manageable.
As a level 8, your equipment is very limited. Personally, I'd use the Star Ninja Grasshopper. Its not that strong, but it should do for your level. Next, your weapons. You seem to have trouble hitting the monster on the weapon's special. That's fine, as he does indded have a high Ranged defense, and there actually is a solution to this. When you're trining STR, he has 15 Melee defense, IIRC, so focus on hitting him there. Use the Stun Baton XV7; a no-special weapon. You should be then set to go- prepare a heal spell ( Medic II), a gauntlet (you should only have one choice, IIRC), and a pet, any pet. Also, be sure to have your SP at its fullest.
Head over to battle Tronzor. Once your HP gets into the 50's, use the healing spell you prepared. In your Battlesuit, just keep using the Knee attack, and if you've got enough SP, use the Kick attack. Use your potions if your HP gets low; drink 2 at a time. If you're out of potions and you feel that you can't deplete his HP, drink an MP potion, and use the healing spell.
Finally, if you still can't beat him (and you're a WG), use you No-Drop weapon. It's special (the WG Dragon one), deals Void damage and is pretty strong. But only use it if you're super duper desperate, as you'll be relying on luck to win the battle for you.