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Here’s my take:
Legendaries that are unique species:
>Creation Trio (although Arceus can create more)
>Arceus
>Lake Trio
>Wether Trio
>Regigigas
>Tao Trio
>Xerneas and Yveltal
>Mewtwo
>Magerna
>Tapus
Not unique:
>Mew, evolved into most Pokémon so they needed to breed at some point
>Eon duo, dex says they fly in herds
>Birds, have variants.
>Lugia, anime has a baby one but the anime’s cannon is questionable.
>Deoxys, anime has too and there could be more in space but it’s uncertain
>Manaphy, breeds
>Hetran, they have identifiable genders and probably reproduce in some way.
>Zygarde, colonial organism with enough parts to make multiple
>Diance, rare mutation of Carbink that has happened before (anime)
>Silvally, started to me multiple and more have been created
>Cosmog line, have distinct genders and reproduce
>Meltan, there are multiple
>Kubfu, Mustard has one
>Zarude, started to be multiple
Dubious:
>Regis, Regigigas could’ve made more but it’s never said or contradicted
>Beasts, where created but dex says there could be multiple Entei (could just be a myth)
>Celibi, time travel
>Musketeers & Keldeo, probably part of a species but our individuals have unique lore (think deviants from Monster Hunter)
>Nature Trio, probably unique but not enough info
>Genesect, game implies only 1 but anime has multiple
>Necrozma, could be more in ultra space but no direct evidence
>Galar dogs, same as the Musketeers except more likely
>Eternatus, could be more in space
Not enough information:
>Ho-Oh (probably unique)
>Jirachi
>Cresselia
>Darkrai
>Meloetta
>Victini
>Hoopa
>Volcanion
>Marshadow
>Zeraora (probably multiple)