Not counting Pokemon, it would be KH3D so Riku vs a Milotic
Both are beautiful
Both can seriously take hits
Both have reliable recovery moves, Curega and Recover respectively
Both can deal out some serious damage.
Neither have a type-advantage over the other.
With the current command deck, Riku would win due to no PP limitations. Plus he'd be able to dodge practically anything with Dark Roll and block most attacks with Dark Barrier. I'd say it's actually a pretty good fight but Riku wins in the end.
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