Max and Bonnie (FourthWheelShipping)

FourthWheelShipping (Japanese: 四番車シッピング Yoban-shashippingu) is the belief that Max and Bonnie are in a romantic relationship, preferably when they're older.

About
FourthWheelShipping is one of the only Pokemon pairings that involves two kids under 10 years old. Many supporters like the couple because it's unique, and makes for an interesting way to start their relationship.