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It is about ID numbers
Breeding rate
The chance of getting an Egg is 69.3% (has a value of 70). The old man in the Day Care will say: “The two seem to get along very well.”
The chance of getting an Egg is 49.5% (has a value of 50). The old man in the Day Care will say: “The two seem to get along.”
The chance of getting an Egg is 49.5% (has a value of 50). The old man in the Day Care will say: “The two seem to get along.”
The chance of getting an Egg is 19.8% (has a value of 20). The old man in the Day Care will say: “The two don’t seem to like each other.”
The Pokémon are incompatible and therefore will not make an Egg. The old man in the Day Care will say: “The two prefer to play with other Pokémon than each other.”
From:http://bulbapedia.bulbagarden.net/wiki/Pokémon_breeding