Deidara has this one. He has the advantage of having intel on Onoki's jutsu, which gives him a distinct advantage. He's aware of the fact that he should not underestimate the power of his master, and would definitely stay alert.
Countering the Jinton
The reason most people would give this match up to Onoki is because of the immensely useful Jinton, but however, it has a certain weakness, which can be exploited by someone like Deidara who has intel on Onoki, having been his personal student.
The biggest weakness of the Jinton is the fact that it takes time to
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, as we all know. Knowing about the Jinton, Deidara would obviously back away and get into a safe distance, exactly like he did against the Tsuchikage in that scan over there. While this process is going on, the hands cannot be split, just like shown when Akatsuchi stopped the technique by separating the
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of the Tsuchikage.
This being the case, Deidara is aware how he can prevent the Tsuchikage from using the Jinton, by simply doing exactly what he did in his battle at the Turtle Island, staying in
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range, in order to prevent the Tsuchikage from creating the Jinton. By doing this, he can make sure that whenever Onoki tries to create a Jinton, he'll be there, ready to stop him with a minor C1 bomb, such as the ones he used against Gaara, who have been noted for their
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.
This having been said, Onoki wouldn't be able to pull off a Jinton before Deidara attacks him first, rendering the Jinton useless.
Attacking Onoki
Deidara's clay allows him to create many bombs at once, some of which are even faster than him and Onoki himself. Undoubtedly, the battle would take place in the air where both wait for a chance to get a hit off on one another, which is where Deidara uses the advantage granted by overwhelming the opponent with numbers to it's fullest.
Onoki might be able to create Rock Clones, but even so, the Rock Clones have never been seen using techniques, much less the Jinton itself, and seem to have rather be used as diversions. The amount of clones he has been shown creating at a time are max four, meanwhile, Deidara has been shown creating something as large as the
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almost in an
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, which also included 50+
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, a guided
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, another
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, a large scale
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, and yet another
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. Note that this had already been created and was ready for use instantly, meaning that Deidara managed to create all this, along with all the things the dragon had yet to show, in around two seconds.
This allows Deidara to use these numbers to overwhelm Onoki by using Clay Clones, Missiles, and Birds to attack him and the clones from multiple directions, which would without a doubt defeat Onoki in the end.
Another way to approach would be by waiting until Onoki tries to attack with the Weight Jutsu or the Rock Fist, which both require Close Contact (With Jinton being ineffective, this'd be his only chance of getting to Deidara, and counter attack with a
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. (Which Onoki has no intel on whatsoever) In the end, this would be Onoki's downfall, if he manages to survive the flurry of bombs sent from Deidara, which is unlikely.
Conclusion
Deidara has counters for everything Onoki has to offer.
Jinton is countered with Close Range fighting, which Deidara would certainly resort to, knowing Onoki and his techniques. This gives him the chance to attack Onoki before he attacks Deidara, since the Explosive Clay takes less time to form than the Jinton itself. Another approach would be to simply distance himself from Onoki, and create Bunshins to multiply Onoki's targets.
Rock Clones are countered by Deidara's superiority in numbers, which are able to attack, something the Rock Clones have not been shown to be able to do.
Weight Jutsu and Rock Fist are countered by Deidara's Close Range C4, which Onoki has no info on, and would therefore not be able to provide an effective counter to.
Deidara has this one, high diff