It would probably result in a regular Skitty. If this rumor is true, it's still unlikely that all combinations of Pokemon will get specific sprites. That would be over 3000 sprites.Lol I wonder what happens when Wailord breeds with Skitty a kitten with whale tail?
Oh, and if this rumor is true, coding would have to be added to the game for it to remember what the parents were. Either the game will internally see Pokemon as Pichu1 (regular), Pichu2 (notched ear), etc, or some secret thing like that of which determines if a Pokemon is shiny or not will be added.