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Engineered from the brown rat (Rattus Norvegicus), PKMN 019 is designed to accentuate the most detrimental traits of its host species. When introduced into an enemy compound, 019 will locate any possible source of nourishment and reproduce rapidly, devouring and destroying food stores in equal measure. In addition, rattata serves as an ideal host for many rodent-borne diseases, spreading illness and disease among enemy soldiers. While certainly not the strongest monster in Kanto's gene banks, it can cause havoc under the right conditions.