Rare mutated golden Australian possum is named Pikachu
This golden possum may look as close as we may come to Pikachu, but it thankfully doesn't have any of the Pokemon's abilities.
While rare as a percentage of the wider population, Pikachu isn't the only golden possum in the area; Wildlife Victoria's Caroline Dazey says there are "little pockets of them in Victoria and we try to keep their location secret to keep them safe". Of course they're found in pockets. That's where pocket monsters live.