Onoki takes this mid diff. He can fly to avoid the majority of Jiraiya's attacks and once Jinton is ready to be fired off, Jiraiya dies.
Jiraiya has plenty of summons which he can use to reach onoki, Onoki wont be able to escape from him
Jiraiya wins this. He can summon Boss Toads that can hrut Onoki, or at least distract them. Gamaken is very agile, so touching him would be harder said than done. Once Jiraiya gets in SM, frog song finishes Onoki. Onoki could have the possible back spasm.
Onoki takes this mid diff. He can fly to avoid the majority of Jiraiya's attacks and once Jinton is ready to be fired off, Jiraiya dies.
How does Onoki counter frog song and toad stomach?
Jiraiya has frog song, so ultimately he wins.
Summon toads to distract onoki, enter sage mode and game over.
Actually jiraiya doesnt even need sage mode. he could just summon ma and pa and they can use the frog song.
Either way onoki dies.