Give Pufluff a 2nd ability

[Nekra]

Pufluff is not only pokemon who can cause this problem (surprise with HA, HA is really secret or really hidden).

Por exemple:
Tonemy - has regular ability Levitate, no HA
Tofurang - except regular ability Intimidate can have HA Moxie

S51 - has regular ability Levitate, no HA
S51-A - except regular ability Intimidate can have HA Analytic

Although I don't like changing pokemons during progress (including types, stats, abilities, learnable moves etc.) I did not clearly undestand how these realy hidden abilities works in breeding and when the are genereted (when pokemon is caught or when it evolved).

If it is neccesary add an ability (It would make understanding HA passing clearer.), why to Pufluff only? I doubt it is such a huge difference in comparison with pokemons who have not branch evolution.