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If they were regular species, most would be 50/50. The following are the exceptions
>Majority or Entirely Male
Darkrai, Zekrom, Swords of Justice, Genesect (because it would be a fossilmon), Tapu Koko, Tapu Bulu, Solgaleo, Buzzwole, possibly Kartana because of its counterpart
>Majority or Entirely Female
Reshiram, Meloetta, Tapu Lele, Tapu Fini, Lunala, Nihilego, Pheromosa, Celesteela
>Gender Unknown
Regis, Arceus, Kyurem (following similar logic as Shedinja being a genderless empty husk), Necrozma, Stakataka, maybe Mew, maybe Xurkitree
Not sure about Diancie or Magearna. They're definitely feminine, but one is a mutated Carbink (which are gender unknown) and the other is artificial + inorganic which tend to be gender unknown (e.g. Magnemite, Golett, and Klink).