Ok, a question about Happiny/Chansey/Blissey
Are they lesbians??
Or do you have to breed them with a different species
Yes, it is possible.
First, you need a Wobbufet that has Counter + Mirror Coat (Male)
Then, have a Gastrodon (Female)
Breed it until you get a male Shellos that has both those moves
Then breed it to a Female Mudkip and voila You have the Mudkip you wanted