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I believe it now, I posted a theory a few days ago that the Chinese leaker only played Pokemon moon and thus didn't see the day formes of the starters.
For example, he said only that rockruff evolves into a werewolf, not mentioning the split formes at all. Since moon version is at night a lot of the time, it's reasonable to assume that's when he evolved his rockruff and never even knew it had it had a daytime form. Since the starters also have a secret, I presume they also have daytime formes.
This would mean the leaked starter evolutions are the night ones since the leaker never mentioned any others. Since your rival has a starter too, I imagine it will evolve into the night version in moon and daytime in sun.
