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Give Rhydon Head Smash, and Shore Up too maybe.
Rhyperior is 535, and Rhydon is 485, so to keep the gap, Rhyperior would be 555 and Rhydon 505, and i'd distribute it as such:
>HP 110 (+5)
>Attack: 135 (+5)
>Defence: 120 (+0)
>Sp.Atk: 40 (-5)
>Sp.Def: 55 (+10)
>Speed: 45 (+5)
& Rhypericuck gets the same but -5 speed which goes to attack, and has rock wrecker changed to 160 so it has a slight niche over head smash.
If head smash is a no-no since the horn gets in the way, then replace rock head with sand stream and reckless with sand force/intimidate/sand rush, or, for the banter, No Guard for horn drill.
It's hard to find a point where it's strong but not too strong, because ground/rock really fucks it hard with weaknesses, but I don't want it to be invincible against anything that isn't water or grass.