I'm confused are you asking for advice or begging (which will mostly just annoy people who work hard for their CE/CR)?..

If you have a BTS sitting in your Arsenal, then use it. It is the single best shield for a swordsman to use vs the JK.

I would recommend spending some time grinding T1 arenas to earn yourself enough crowns to craft up some 3* gear and put some heat on it. Pick the gate that has the most Arenas, then use the "Gate Map" (click the cog in your upper left) to check the next map. Wait at the elevator until the Arena shows up. Then make sure to play all three rounds of each arena. Also, hit those T1 danger rooms for extra loot, heat, and practice.

You have a wide range of 2* weapons listed there. Figure out which type you are best with (2 swing swords, 3 swing swords, 5(10) swing swords. If you are using a 2 weapon loadout you probably will want to stick to normal damage, though if you are using a gun & only using vs constructs then go elemental.

Remember the JK will heal all the time unless you keep a status effect on him (poison, fire, curse, etc.). You have to keep up the pressure on the JK & maintain a status effect on him. Don't get bogged down in the little jellies. The whole way to the JK try to save up vials (curse, poison, fire) & health pills (don't bother with cure pills).

Mostly you just need to gear up. If you were really good you could take the JK in 2* armor (or if you got pulled through by a good party), but I would recommend most players to get 3* gear first.

Shadow damage will only help you against the small slimes not the King. A shadowtech alchemer is not going to be too helpful because it is hard to get a clear shot at the JK and the DPS is not really good enough, plus slims are easy enough to melee. If you want to take a gun I would go with elemental or normal and use it vs constructs.

My first JK solo kill was with:

Ash Tail Set
Sinister Skelly Shield (not at all suited for the run, just best I had at the time)
Ascended Calibur
Super Blaster
Elite Sword Focus Module
Elite Slash Module
3x health pills, 3x curse vial, 3x poison vials, 3x fire vials

I actually really like the Calibur for the JK because the charge will hit him 3 times and clear the little stuff back at the same time. You just have to keep hitting him with vials so he cant heal. A lot of people like the Vile Striker for the JK because of the poison, I might try this sometime, but I'm in no hurry as it is not really needed.

*wow this post is way too long*

Better get bombs too. i most reccomend the fire status effect bomb with large range of fire for the mini royal jellys protecting the royal jelly. get good long range weapons like the 3 to 4 star handguns that can shoot 3 to 5 consecutive times. close range with ur sword will most likely get u badly wounded or killed. place most of ur trust on the elemental effect bomb for its ability to not only weaken the enemy but also slow it down too. (for best results, use bombs with "low time reduction" which means the charge time for the weapon is quick giving the maximum amount of damage in the shortest amount of time.) If ur planning to beat the royal jelly, then bring at least 2 friends along because by the info u said to us, u don't have alot of 3 star item on ur hands. the Toxic Vaporizer is a good 2 star bomb because of its ability to inhibit the mini jellies to heal him from its wounds but if u can go the extra mile of making a 3 star Toxic Vaporizer or 4 star, then it is crucial to bring friends along because just poisoning the RJ is not enough. Once the RJ is poisoned, it should give ur friends an opening window to attack the RJ directly with whatever weapon they have to cause as much damage as possible since the RJ's minis are unable to heal him. for the most success of beating the royal jelly, have each knight take apon a role of beating the RJ. for example: the knight with the best sword and sheild and skill should distract the minis and the jelly pawns. the knight with the best long range weapons (handgun and bomb) should take apon the role of rendering the RJ helpless. And the rest just go directly to the RJ and BEAT THE CRAP OUT OF HIM! With everyone a job to uphold, the boss battle should go smoothly with minor difficulties. i know this is one hell of a paragraph to write but this is exacly how i beat him with my friends. (i had the role of beating the crap out of him! :))