1. Dragonair and Milotic
2. Gardevoir and Gallade
3. Latios and Latias
4. Nidorino and Nidorina
5. Pikachu and Buneary
6. Plusle and Minun
7. Pikachu and Pachirisu
8. Pichu and Pichu
9. Mightyena and Absol
10. Pikachu and Eevee
11. Umbreon and Mew
12. Pikachu and Pikachu
13. Pachirisu and Shaymin
14. Illumise and Volbeat
15. Mudkip and Cyndaquil
16-17. Umbreon and Espeon
18. Jolteon and Umbreon
19. Jolteon and Glaceon
20. Umbreon and Flareon

My fave is Illumise and Volbeat!