Implicating cosmog → legendary_pokémon
Link to implication

additionally:

Implicating cosmoem → legendary_pokémon
Implicating solgaleo → legendary_pokémon
Implicating lunala → legendary_pokémon
Implicating necrozma → legendary_pokémon
Implicating magearna → legendary_pokémon
Implicating marshadow → legendary_pokémon

Reason:

These are legendary Pokémon introduced in Generation VII.

Related:

• Tag Implication: marshadow -> pokémon] by Johannes

+1. Seems appropriate.

Now we just wait to see if the ultra beasts, tapus, type-null and silvally are legendary/mythical or not.

Johannes said:

Implicating marshadow → legendary_pokémon

Already mentioned before (forum #227849).

O16 said:
+1. Seems appropriate.

Now we just wait to see if the ultra beasts, tapus, type-null and silvally are legendary/mythical or not.

Already mentioned before (forum #227849).

Tapus are, but Ultras are Ultras. Why Necrozma isn't, I don't know.

Furrin_Gok said:
Tapus are, but Ultras are Ultras. Why Necrozma isn't, I don't know.

It is a bit more complex. Tapus are described as deities in game, however they were never really recognized as legenderies; Sun & Moon pokédex identifies the legendary pokéomon, however put them (along with type-null, silvally and the UBs) in some kind of "apart category"; a couple of official competitions prohibit legendary/mythical pokémon, however allow them (along with type-null, silvally and the UBs), the inverse also occurs.