Grimer

Grimer is a Poison-type Pokemon composed of living sludge, a slowly flowing mass of toxic matter that somehow constitutes a personality. It thrives in polluted, waste-rich environments and wears an expression of such pure, uncomplicated contentment that it is almost impossible to stay annoyed by its existence for long.

Professor Tangrowth treats Grimer populations as a direct measurement of island activity level, and considers their absence a sign either of an ecologically pristine environment or a suspiciously underperforming one.. On Pokopia Island, Grimer is drawn to areas with high Infrastructure and Commerce sub-scores that reflect the material throughput and industrial activity of a busy settlement. Utility zones, Recycling areas, Waste Bin installations, and the general backstage infrastructure of a productive community suit its preference for the less glamorous parts of island life. It is not a visitor that enhances the aesthetic of any space it occupies, but its role as an ecological processor of urban byproducts is genuinely useful