Leylin_Farlier a weapon that helps you to cultivate, ingenious ,!
Ok then i choose nanites with inbult data on omnitrix and hulks bloodline and speed force as my internal energy
Also gokus base body with all his fighting style as memory
And while at it a pet like lord 3 and upgarde of ben ten fused
What kind of weapons is your most-wanted?
gorky PICK ONE AND ONLY ONE!
Nanites would just get destroyed after you cultivate, afterall nanites are without a doubt considered an impurity in the blood. Your cultivation would kill them, unless you never cultivate and die 60 years after transmigrating.
Hulks bloodline would suck ass.... You'd get killed so easily if it ever triggered.
Speed force as your internal energy.... Fuck off, you have to cultivate speed force, you don't just get it. Maybe a sword belonging to the lord of speed that contains insights into speed force would be fine, but not straight up getting it for free.
Gokus base body is fairly trash, afterall the base body is the moment you are born, so you only have potential, not power..... Also his body might be a weapon, but his memory isn't.....
A pet isn't a weapon. A living being can't be considered a tool, an item spirit does not equal life so you can choose a sentient golem dog, but that'd be lame.
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Leylin_Farlier okay but hulks bloodline has no upper bound limit though have work on the rage issue , gokus body will give boost after every near death ,and for pet can settle for goder , from jimmy neutron
Also if i really have to pick only then let it be the gammers abilty seen that manga ? Now i got everything practically for free
gorky .... Congrats, you win the internet.
Leylin_Farlier atleast make it gdn
The best weapon is indoubtably a sharp mind, unyielding before any enemy and faster than light itself. Only with a strong mind can you defeat any foe that dares stand in your way.
Moderator Hello sharp mind, meet mister fist...... Fat lotta good that did :) lol.
for the mind its nzt permanent dose (from limitless sitcom )Leylin_Farlier well his minds really sharp he could just kung fu his way out of there ,
you are left gasping There on the ground like fish out of water 
gorky Fine..... See how his sharp mind meets one punch mans fist.
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Leylin_Farlier uses instant teleport used by goku
Let one punch man catch up i will hava something by then a wig for him?
MY WEAPON WILL BE AN UMBRELLA
RenegadeXX Reaper scythe