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Can't determine specific IV for Pokémon
So I have this Chansey (I don't think it was hatched) that I really want to check the IVs of. I want to know the exact value, not a range. I entered in the stats and got three possible ivs, 82, 89, and 91. I then refined it and the 89 disappeared. It was down to 82 (15 14 8) or 91 (15 13 13). I refined it three more times but it couldn't figure it out. I didn't want to waste anymore chansey candy unless I knew it was going to find the exact values. What should I do to determine whether it's 82 or 91?