The question asked if Alolan Marowak was the only fire type that can learn an ice move. Who cares if XYZ fire types can learn XYZ ice moves? I answered the question using some Pokémon as source, so I think it's fine. But I think the asker will appreciate knowing all the Pokémon, so thanks for telling me anyways.
And about Victini knowing Glaciate, PokemonDB didn't include event-only moves when I clicked on Glaciate. Kyurem was the only Pokémon that popped up, I'm pretty sure.