The most stringent and implacable foes of anti-littering legislation in the pokemon world are not the great polluters of Celadon City, nor Unova's Trubbish and Garbodor trainers, but the Zigzagooners of Hoenn – an unlikely rival, for these are group of people who often clean more litter than any such laws in their own right. Carrying teams of one powerful pokemon and five Zigzagoon, they walk around through tall grass, using their pokemon's unique ability to find and restore discarded items: for a skilled trainer with a talented Zigzagoon, even rare candies can be recycled.
Zigzagooning originates not from a scavenger's versatility, but as a panicked search for weapons and healing which these weak pokemon attempt instead of fighting back whenever they are attacked by wild pokemon. The task of their trainers and the team's one non-Zigzagoon pokemon is not to knock out their foes immediately, however easy it may be to do so, but to protect their teammates until they finish finding and restoring all the valuable items on the ground and hidden beneath the soil: only then do they finish the match.
The reason Zigzagooners oppose these laws is because although a Zigzagoon's tiny paws and large spikes are amazing at restoring the items of others, these pokemon are incapable of recognizing any item they or their trainers have used as an object which can be brought back to a usable state, so Zigzagooners must rely on litter for their riches. Perhaps if they could restore their own items, physics as we know it would be called into question and scarcity eliminated in this world, for a competent Zigzagoon can restore items from ultra balls to max potions without any loss of effectiveness whatsoever.