Sorry, I had this page open for a while and didn't notice. And you were only best answered 2 minutes before I posted, and there was another question asked, so I decided to give an answer. It's not 50/50 if Buneary has 2 abilities and Lopbunny has 2 abilities, one of which is the same as its pre-evolution. The only case it will be 50/50 is if the pre-evolution only has 1 ability and its evolution has 2 abilities.