Where do you find crazy redds shop in Animal Crossing

in animal crossing lets go to city, redds shop is in the city. when you get off the bus, go up the stairs and take a left. keep going along that path till you reach a metal door, that's redds shop.
but in animal crossing wild world, redds shop comes in the form of a tent. it will come at random times and will be outside your town hall. it is a green tent with redds leaf on it.