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Very little. The split evo leak hasn't really gotten anything completely right and they mention Alolan Arcanine when we've already seen regular Arcanine in one of the trailers. Every other Pokémon that got an Alola form wasn't shown in its regular form at all, except for the Meowth which CAME WITH THE PLAYER CHARACTER fromt their home region/Kanto, so it's not Alolan. Could be a minor error like the Fairy Wind Gardevoir and Ice Punch Blaziken, but it does reduce the credibility of the split evo leaks, which was already very low.