Garbodor notes. Though I’ve never actually trained one I think they are interesting pokemon. Headcanons abound.

Garbodor are fairly large Pokemon that inhabit urban environments, and are especially tolerant of pollution, even thriving in it. Their ability to eat almost any organic matter suits them well as scavengers, subsisting on garbage and rotten food with ease. They are not fast-moving or particularly suited to hunting, and do not attack living people or Pokemon unless starved, afraid, or protective of their young. 

Both adults and pre-evolved young (Trubbish) exhibit little sexual dimorphism. Females are on average slightly larger, and similar to the real-life surinam toad, carry their eggs embedded in their backs. Despite this distinctly amphibious method of reproduction, Garbodor do not habitually spend time in water, and cannot learn Water-type moves beyond Rain Dance.

Garbodor are protective parents, caring for their young almost up to the point of evolution, though under stress they may eat their offspring. The feathery appendages on adult Garbodor are thought to be used in mating or aggression displays, and on juveniles they may serve as decoys for predators, and regrow if torn off.

Its constant shedding of its outer layer of skin is a topic of debate among Pokemon researchers. Some suggest it is a form of camouflage, adapted to let the Pokemon live among trash bags. Garbodor living far from civilization exhibit different patterns, mimicking fallen leaves or rocks. Others suggest that it is used for defense. An attacking predator would grab only a bunch of loose skin, allowing the Garbodor time to retaliate with the venomous spurs on its legs, or with a spray of acid. 

Garbodor live easily among other urban Pokemon, such as Koffing and Muk, and do not engage in territory disputes unless food is scarce. Strangely, they are unable to breed with any other Poison-type Pokemon, including the biologically similar Muk and Grimer. They can instead breed with Pokemon in the Mineral group, which includes such species as Geodude and Onix. Some theorize that Garbodor’s typing was quite recently changed to Poison, possibly losing a secondary Rock or Ground type as it adapted to surviving in human civilization. Garbodor living in uncivilized locations are still classed as pure Poison, despite a greater propensity to learn Ground and Rock-type moves.

As usual, Trubbish bred from captive specimens, or taken very young from the wild, make better companion Pokemon than fully-grown adults, which can be obstinate and slow to learn and obey. Nevertheless they are reasonably hardy Pokemon, suitable for intermediate trainers and up.