Mechroach + Cheardidi & Snozzle

Mechroach: Evolves from Garboach with metal coat. Their exoskeleton have absorb the metal quantities of all the food they ate to become an impenetrable shield. Males shudder junkyards in their battle to impress females. Despite their fierce appearance, they can only hiss and not make any loud roars.

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Cheerdidi and Snozzle: These two Pokémon aren't related but are always seen paired together, and therefor considered as one. The relationship is uncertain, but it's possible that Cheerdidi gets protection from Snozzle in return for its chears that motivate Snozzle to fight greatly. Truth is, Snozzle is the only one of the two actually seen fighting. Cheerdidi doesn't appear to know any offensive attacks of its own.