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Armaldo, the Plate Pokémon. Armaldo can withstand any attack with its hard shell. It is thought to have been able to break even stones with its powerful claws.
– Ash’s Pokedex
The colouring on Armaldo doesn’t say “Rock” or “Bug”, but more Steel or Dragon or something. I’m not too familiar with this Pokemon, it being 3rd Gen and a fossil Pokemon. Like most fossil Pokemon, it has lots of Attack and not too much Speed. It has a pretty unique type combination, Rock and Bug cancel out some of each other’s weaknesses.