Rúyì Jīn Gū Bàng

Silver pole once owned my the infamous sun wukong.

Polearm

178.5 billion tons

Unknown

Can grow to any size and transform into any melee weapon but can also take the forms of most other items such as armor, gloves, comb, pin, bowl, ect. is indestructible can infuse with ones spiritual power or aura to strengthen further.

72 Bian/"72 Transformations": Allows him to shapeshift into almost any form—however, he is never able to transform his tail. He can also transform each of the 84,000 hairs on his body into another form, animate or inanimate, and often bites the hairs into pieces to create even more copies.
Bi Huo Jue/"Fire Avoidance Charm": Allows him to survive fire.
Bi Shui Jue/"Water Avoidance Charm": Allows him to survive deep water; however, he is unable to fight while using this ability.
Body Freezing Spell: Allows him to immobilize enemies.
Huǒyǎn-jīnjīng(火眼金睛)/"fiery-eyes golden-gaze": Allows him to identify evil no matter what form it takes; however, it also causes smoke to sting his eyes. Wùkōng acquired this ability after Lao Tzu traps Wùkōng in his cauldron for 49 days, attempting to distill him as punishment.
Jie Suo Fa/"Lock-Breaking Spell": Allows him to point a finger or his staff and open any lock.
Jīndǒuyún/"cloud-somersault" or “cloud trapeze”: Allows him to cover 108,000 li (54,000 km, 33,554 mi) in a single leap.
Protective Circle: Allows him to erect an impassible barrier by drawing a circle on the ground with his staff.
Shen Wai Shen Fa/"Body Outside of Body": Specifically refers to his ability to transform his hairs into fighting clones of himself.
Summoning: Allows him to summon local deities.
Wind: Allows him to summon strong winds and storms.