Nintendo eShop's best sellers (first half of 2017)

The title describes the content of this entry very well

Nintendo Switch

Overall rankings

01. Snipperclips: Cut it out together! (Nintendo) - {03/03/2017}
02. Minecraft: Nintendo Switch Edition (Mojang) - {12/05/2017}
03. Mario Kart 8 Deluxe (Nintendo) - {28/04/2017}
04. Kamiko (FlyHigh Works) - {13/04/2017}
05. The Legend of Zelda: Breath of the Wild (Nintendo) - {03/03/2017}
06. ACA Neo Geo Metal Slug 3 (Hamster) - {03/03/2017}
07. Arms (Nintendo) - {16/06/2017}
08. 1 2 Switch (Nintendo) - {03/03/2017}
09. ACA Neo Geo The King of Fighters '98 (Hamster) - {03/03/2017}
10. Othello (Arc System Works) - {03/03/2017}
11. Voez (FlyHigh Works) - {03/03/2017}
12. Super Bomberman R (Konami) - {03/03/2017}
13. New Frontier Days: Founding Pioneers (Arc System Works) - {03/03/2017}
14. Blaster Master Zero (Inti Creates) - {03/03/2017}
15. ACA Neo Geo Metal Slug (Hamster) - {30/03/2017}
16. Human Resource Machine (FlyHigh Works) - {08/06/2017}
17. Flip Wars (Over Fence) - {18/05/2017}
18. Shovel Knight (Yacht Club Games) - {30/05/2017}
19. Ultra Street Fighter II: The Final Challengers  (Capcom) - {26/05/2017}
20. Maison de MAOU (Mebius) - {13/04/2017}
21. Wonder Boy: The Dragon's Trap (DotEmu) - {18/04/2017}
22. Seiken Densetsu Collection (Square Enix) - {01/06/2017}
23. Puyo Puyo Tetris S (SEGA) - {03/03/2017}
24. Mighty Gunvolt Burst (Inti Creates) - {15/06/2017}
25. Thumper (Drool) - {18/05/2017}

Nintendo 3DS 

Ranking of retail games

01. Monster Hunter XX (Capcom) - {18/03/2017}

02. Cube Creator DX (Arc System Works) - {27/04/2017}

03. Fire Emblem Echoes: Shadows of Valentia (Nintendo) - {20/04/2017}

04. Dragon Quest Monsters Joker 3 Professional (Square Enix) - {09/02/2017}

05. Animal Crossing: New Leaf - Welcome amiibo (Nintendo) - {23/11/2016}

06. Terraria (Spike-Chunsoft) - {21/04/2016}

07. Super Mario Maker for Nintendo 3DS (Nintendo) - {01/12/2016}

08. Shin Megami Tensei IV: Apocalypse (Atlus) - {10/02/2016}

09. Momotaro Dentetsu 2017: Tachiagare Nippon!! (Nintendo) - {22/12/2016}

10. RPG Maker Fes (Kadokawa) - {24/11/2016}

11. Mario Kart 7 (Nintendo) - {01/11/2012}

12. The Legend of Zelda: Ocarina of Time 3D (Nintendo) - {01/11/2012}

13. Miitopia (Nintendo) - {08/12/2016}

14. Fire Emblem Awakening (Nintendo) - {30/01/2013}

15. Yo-kai Watch 3 Sukiyaki (Level-5) - {15/12/2016}

16. Pokémon Sun (Pokémon Co.) - {18/11/2016}

17. Pokémon Moon (Pokémon Co.) - {18/11/2016}

18. Poochy & Yoshi's Woolly World (Nintendo) - {19/01/2017}

19. Tomodachi Life (Nintendo) - {18/04/2013}

20. Pro Yakyuu Famista Climax (Bandai Namco) - {20/04/2017}

21. Super Smash Bros. for Nintendo 3DS (Nintendo) - {13/09/2014}

22. Dragon Ball Heroes: Ultimate Mission X (Bandai Namco) - {27/04/2017}

23. Monster Hunter Generations (Capcom) - {28/11/2015}

24. The Alliance Alive (FuRyu) - {22/06/2017}

25. Story of Seasons: Trio of Towns (Marvelous) - {23/06/2016}

Ranking of digital only games

01. The Battle Cats POP! (PONOS) - {31/05/2015}

02. ByeBye BoxBoy! (Nintendo) - {02/02/2017}

03. Ice Station Z (Wobbly Tooth) - {05/04/2017}

04. Cube Creator 3D (Arc System Works) - {15/07/2015}

05. Kirby Fighters Z (Nintendo) - {23/07/2014}

06. Tank Troopes (Nintendo) - {21/12/2016}

07. Battleminer (Star Sign) - {10/02/2016}

08. Of Mice and Sand (Arc System Works) - {02/09/2016}

09. 3D Classics. Kirby's Adventure  (Nintendo) - {25/04/2017}

10. Chou Chari-Sou: Atsumete! Choujuu Hunter (Spicy Soft) - {24/02/2016}

11. Bike Rider DX (Spicy Soft) - {26/12/2012}

12. Pokémon Dream Radar  (Pokémon Co.) - {23/06/2012}

13. Urban Trial Freestyle (Rainy Frog) - {27/11/2013}

14. Stick Figures Challenge!  (Bandai Namco) - {20/04/2016}

15. Azure Striker Gunvolt 2 (Inti Creates) - {25/08/2016}

16. Neko Atsume (Hit Point) - {26/04/2017}

17. Brave Dungeon (Inside System) - {30/11/2016}

18. Final Fantasy  (Square Enix) - {21/01/2015}

19. Picross e7  (Jupiter) - {27/04/2016}

20. Puyo Puyo 20th Anniversary Mini Version (SEGA) - {07/11/2012}

21. Super Smash Bros. Controller (Nintendo) - {15/06/2015}

22. Chat-a-Lot  (WaiS) - {24/07/2013}

23. Fairune 2  (Rainy Frog) - {13/07/2016}

24. BoxBoxBoy! (Nintendo) - {06/01/2016}

25. Urban Trial Freestyle 2  (Rainy Frog) - {17/05/2017}

Ranking of Virtual Console games

01. Pokémon: Yellow (Nintendo) - {27/02/2016}

02. Super Mario Bros. 3 (Nintendo) - {01/01/2013}

03. Super Mario Bros. (Nintendo) - {05/01/2012}

04. Pokémon: Red (Nintendo) - {27/02/2016}

05. Super Mario World (Nintendo) - {04/03/2016}

06. Fire Emblem: Genealogy of the Holy War (Nintendo) - {27/08/2016}

07. Super Mario Bros: The Lost Levels (Nintendo) - {25/07/2012}

08. Earthbound (Nintendo) - {04/03/2016}

09. Final Fantasy III (Square Enix) - {23/04/2014}

10. Pokémon: Blue (Nintendo) - {27/02/2016}

11. Pokémon: Green (Nintendo) - {27/02/2016}

12. Kirby's Dream Land 2 (Nintendo) - {15/02/2012}

13. Fire Emblem: Thracia 776 (Nintendo) - {28/11/2016}

14. Live A Live (Square Enix) - {28/11/2016}

15. The Legend of Zelda: A Link to the Past  (Nintendo) - {04/03/2016}

16. The Legend of Zelda: Link's Awakening DX (Nintendo) - {08/06/2011}

17. Fire Emblem: Mystery of the Emblem (Nintendo) - {22/06/2016}

18. Kirby's Dream Land (Nintendo) - {07/06/2011}

19. Super Mario Kart  (Nintendo) - {09/05/2016}

20. Donkey Kong Country 2: Diddy's Kong Quest (Nintendo) - {06/04/2016}

21. Pokémon Trading Card Game (Nintendo) - {24/12/2014}

22. Fire Emblem Gaiden (Nintendo) - {03/04/2013}

23. Donkey Kong Country (Nintendo) - {04/03/2016}

24. The Legend of Zelda: Oracle of Seasons (Nintendo) - {27/02/2013}

25. Romancing SaGa (Square Enix) - {21/11/2016}

From

https://www.nintendo.co.jp/software/feature/3ds-ranking.html

https://www.nintendo.co.jp/software/feature/switch-ranking.html