This is an old idea that I don't recall if I posted here.... Based on some of the most annoying bugs I've had to deal with. Yes it's live bug season again.
Cupbug--@male and female Cupug in party while both know Attract-->Bugmantic
Bug/Fairy
Simple--
@EVO--->Romantic (Attract works on Pokemon without a gender, and Pokemon that have the ability Oblivious).
HP:70
Att:100
Def:100
S.Att:100
S.Def:100
Spd:30
Cupbug, The Cupid Pokemon.
A Cupbug will spend most of it's life looking for a partner Cupbug to evolve with. They will brave any weather, climate as they search. Once they find their partner they begin a dance that if resipicated ends with their combined Evolution.
Bugmantic, The Romance Pokemon.
Bugmantic is one Pokemon made from two. Having found true love they never leave each other's side and have formed a symbiotic life together. Because of this other Pokemon typically not affected by Attract can't help but feel a bit romantic themselves.