"Average generally.
Extraordinary Genius in Combat (Although he lacks knowledge when it comes to things that aren't related to fighting, Goku is a master of prodigal skill when it comes to martial arts, with years of experience fighting against powerful opponents with a plethora of abilities. As a child, he was able to beat martial artists on such a level as
Grandpa Gohan, who was stated to be an
unparalleled master in all martial arts on Earth, with
martial arts in Dragon Ball exceeding real life towards Dan/Level 30 where there is only 10. In his battle with Master Roshi,
was able to copy and improve upon a technique on sight, later in that same battle once faced against the Sui-Ken,
a martial art he couldn't copy because he had never experienced inebriation, Goku
generated and created his own style known as the "Crazy Fist" in response to perfectly counter it off the top of his head, with these styles even
specifically noted to be a variation of Kenpo. At this point should be so skilled he's beyond 22nd World Tournament Roshi and Tien,
the former of which having such mastery his movements, energy, and breathing have no ineffiency, and the latter being able to detect this merely via observation of scant attacks whilst his future foe was suppressed. Learned
predictive movements and enemy reading in merely three days and was able to immediately apply it in combat. His skill when it comes to
combat and the usage of Ki allows him to replicate other Ki-based techniques after seeing them once, and learned the training of the mind within a day, which takes battles that are dead
even in all physical abilities, except stamina, which was above Goku's,
as well as all techniques go from even to utter defeats of the enemy. Eventually learned to make
absolutely zero unnecessary movements, which is shown by creating
absolutely no sound from bells that react to the tiniest movement. Honed his mind, body, and spirit in conjunction with each other for his martial arts. Should be more skilled than and effective at copying than Vegeta, who was able to replicate the Energy Sensory of the Z-Fighters by merely battling them, and their methods aren't detectable by any known conventional means. He was the first to realize how much energy the Super Saiyan transformations unnecessarily drained and despite the drawback was the first to master the Super Saiyan state, making it highly efficient and subsidizing the need to reach a higher grade, which decreases speed as a side effect. He is a genius in combat and is capable of devising new applications of his techniques on the fly, such as using Kamehameha with his feet, and Goku's
training with King Kai was directly noted to be worth thousands of years of his prior accomplishments, experience, and skill. As a Saiyan, he
has a natural sense for battle and adapts to it quickly. He as able to go toe to toe with
Cell, a being created by the genius scientist
Dr. Gero to be the ultimate warrior, taking the DNA and footage of every fighter on Earth and on Namek,
copying their techniques, their mannerisms, and their skills to create him, including Goku himself, also having knowledge on how he approaches battle as well, down to real-time strategy, something that despite using an advanced supercomputer capable of creating machines that can destroy planets and stars, still took 20 years. Cell was
even noted by others to perfect the martial arts and techniques of those who comprised him such as Tien's Multiform Technique, removing their flaws, and yet Goku was able to face four copies of Cell whilst their physical ability was identical off of his own raw battle intelligence and skill. Should be more skilled than Piccolo, who regularly utilizes perfect copies of himself to train with to hone all of his capabilities to their utmost extent. Fought and beat the Sigma Force, who had combat data on all of his capabilities that allowed them to evade and punish all of his movements by sharply increasing his power and using a move they had never seen before. Goku is capable of seeing the holes, flaws, and errors in techniques and fighters after seeing or hearing of them, such as when he took advantage of the weaknesses within the Multiform Technique after experiencing a single beatdown, how he noticed Hachiyack's sudden weakness at the 15 second mark of his Revenger Cannon Attack, the gap in the Thunder Flash and exploited it to take advantage of an opening, Frieza's inability to sense Ki to create openings in his defenses, or Cell's perfected combat to lure and lead the four fighters into a means of which he can defeat all at once. Identified that it wasn't Haze Shenron getting stronger, but him and Pan getting weaker.
Even outside of Combat, Goku is no slouch mentally. He played on the ego of Naturon Shenron to trick him into making Pan vulnerable so he could free him, planned a convincing act and fight with Nuova Shenron to trick Omega Shenron into a gambit that guaranteed victory outside of a specific ability they had no knowledge of, was able to identify and operate around a plan of Trunks and Giru's own making within secret to then perfectly go along with and bolster their scheme, revealing Baby and allowing them an attempt to kill the Tuffle. Was capable of crafting another plan along with Trunks and Pan to get Baby to reveal his own aims, make himself vulnerable, and defeat him. Goku was capable of realizing how Baby's body possession worked and figured out that cutting off his tail would force him into being ejected."
My current intelligence rating. Any other strategies or things of note in his combat section that I should cover?