This is perhaps the cutest April Fool's Day joke that to ever exist, and it started one day early.

On Monday, iPhone and Android users were treated by the Pokémon that had invaded the Google Maps app. There are at least 150 Pokémon available, which are not the original from the beginning of the series, and they can be found all over the world, according to Kotaku.

They appear as little icons near the locations, and if clicked on, users can save them. The Maps app even comes with Pokedex to help you keep track of all the Pokémon you've caught.

Need help getting started? Here's where you can catch some of them:

1. Munchlax is at the Empire State Building, New York City

2. Pikachu is at the Tokyo Tower, Tokyo

3. Rotam is at the Rockefeller Center, New York City

4. Pumpkaboo is at Red Square, Moscow

5. Helioptile is at the Eiffel Tower, Paris

6. Tyranitar is at Pompeii, Italy

7. Salamance is on 16th Street and 8th Ave in New York City

8. Dragonite is at the Pokémon Company, Seattle

9. Totodile is in the Hoover Dam

10. Togepi and Dragonite are at Sagrada Familia, Barcelona

11. Audino is near Charing Cross Road, London

12.Kirlia at Area 51, Nevada

13. Snorlax is at The Vatican

14. Staraptor is on the Golden Gate Bridge, San Francisco

15. Donphan is at The Alamo

16. Garchomp is near the Great Wall

17. Lucario is on Wall Street.

18.Meganium is at the White House

19. Wartortle is near the Colosseum in Rome

20. Eevee is in Yankee Stadium, New York

21. Raichu is at Cafe du Monde in New Orleans

22. Stunfisk is at Angkor Wat, Cambodia

23. Spritzee is at Disneyland Resort, California

24. Spiritomb is at the Exploratorium, San Francisco

25. There are a few Pokémon at the Googleplex in California.

We hope you didn't have any plans today.