1. Pokémon Diamond – 1,408,657 connections
2. Pokémon Pearl – 959,620 connections
3. Animal Crossing: Wild World – 415,185 connections
4. Mario Kart DS – 320,615 connections
5. Metroid Prime Hunters – 210,471 connections
6. Tetris DS – 144,876 connections
7. Jump! Ultimate Stars – 139,641 connections
8. Dragon Quest Monsters: Joker – 126,819 connections
9. Pokémon Battle Revolution – 61,000 connections
10. Clubhouse Games – 56,849 connections

Source: Neogaf