So guys, some Pokemons are created in pairs, like Dusclops and Banette, Mawile and Sableye.

In gen IV Banette gets shafted when Duskclops gains an evo, and in gen V Sableye gets prankster and leaves Mawile with nothing.

In gen VI Mawile and Banette catched up by geting megas.(Sableye do gets a mega though)

Are there any pairs where one clearly gets more love than the other?In what way do you think they could catch up.