Maybe the more happy the Pokemon is, the higher chance it has of sparkling each turn? When your Pokemon sparkle, they look pretty. Rock Polish would have the effect of doubling the user's chance of sparkling each turn in addition to the speed boost.
In all serious though, we have literally no idea what the new mechanic would be, and I for one prefer the talk of evolving crapmons (plausible) to the suggestions that they make it that happiness increases Evasion (implausible and would incredibly annoying).
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