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Armaldo looks cooler, but Rhydon has more versatility ( Lightningrod on a Ground Poke=Invaluable in double battles.). It can even learn Surf, and many TM's, and Flamethrower on a Pokemon 4x weak to Grass is great, as is T-Bolt for one 4x weak to water.
Edit: And by the way, since when was Rhydon 4x weak to water?