Male
Mewtwo (RBY/GSC)
Latios
Deoxys
Fug
Azelf
Regigigas
Darkrai
Cobalion
Terrakion
Keldeo
Genies
Zekrom
Victini
Volcanion
Hoopa
Koko
Bulu
Non-Canon Nebby
Marshadow

>Female
Mewtwo (X/Y)
Jirachi
Latias
Mesprit
Uxie
Cresselia
Manaphy
Virizion
Meloetta
Reshiram
Xerneas
>Inb4 buck
>What is headcanon?
Diancie
Lele
Fini
Lunala
Magearna

>50/50
Articuno
Zapdos
Moltres
Doggy's
Celebi
Lugia
Shaymin
Phione
Heatran
Cosmog
UB's (Idk nigga)

>Genderless
Regis
Arceus
Palkia
Dialga
Satanichia McDowell Kurumizawa-Sama
Genesect

>Unknown
Ho-oh
Groudon
Kyogre
Yveltal
Puni-Chan
Necrozma

>Other
Kyurem-Grey (hermaphrodite)