Jiro is an incredible hand to hand fighter and in his fused state he has a lot of ranged options as well. Fighting monsters is what he does and so not even a creature like Raikou is going to get the better of him here. Raikou’s got a lot of thunder attacks but simply isn’t fast enough to keep up with Jiro or durable enough to take the hits. Jiro Azuma wins.
Suggested by Destroyer Raikou is a Pokemon of unbelievable power. He is one of the legendaries after all and while that term may not mean a whole lot with some of the fighters, for the most part you can expect a tough fight out of that. Shiron has power ups of his own but I don’t think he would be fast enough to escape Raikou’s attacks or powerful enough to take him out in time. Ultimately Shiron will go down here. Raikou wins.
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