It is said that Arceus created most of the pokemon, Man created a few, such as Porygon, and that Giratina, Yveltal, or some other wicked, twisted god created the Trubbish. In truth, Man created the Trubbish too, but not by design, at least not anymore than Man designed clouds of smog, burning rivers, or global warming. Humanity created Trubbish not by desire, but by capriciousness, for they gladly mixed garbage and industrial waste despite many scientists warning of the consequences.
Yet Trubbish, for all their origins in pollution and possible associated health hazards, have done little to earn their awful reputation. Although it is true that their poison gas is so toxic that it can land people and pokemon in week-long comas, it is rarely acknowledged that Trubbish use it only as a last resort, and only when they believe either themselves or their trainers to be in mortal peril. Their body may be partially toxic, but this is common among single-typed poison pokemon, and any poison trainer should know how to remedy this issue. Nor is it widely acknowledged that by the standards of pokemon danger, the Trubbish are relatively weak; there are many pokemon which hurt or kill humans when threatened, and a few which even do so intentionally, but they are far older, more "natural" species, so are rarely considered abominations.
Pollution may have created the Trubbish, but despite their unusual origins and genetic structure, in behavior they are a pokemon like any other. Trubbish laugh, they cry, they smile, they defend their friends, and they fight their hearts out for those few trainers willing to give these pokemon a chance. And despite their origins in humanity's rampant disregard for the environment, I do not know what more that Man can ask for in a pokemon.