>>56456392So, here's how I'd redo the Elite Four and Diantha. Note that this only takes into account how Pokemon were set up in XY, so no Abilities or Mega Evolutions introduced in later games.
>[Malva]: Mega Charizard Y, Pyroar, Chandelure, TalonflameI felt Malva's picks were mostly fine. If Torkoal had gotten Drought in XY instead of SM, I would've kept it.
>[Siebold]: Politoed (Drizzle), Clawitzer, Mega Blastoise, BarbaraclePolitoed was added to give rain. Gyarados was swapped for Blastoise to avoid redundancy, since Lysandre already used it and its Mega Evolution.
>[Wikstrom]: Klefki, Probopass, Mega Aggron, AegislashScizor was swapped for Aggron as a super bulky opponent, since that seemed to be the theme for Wikstrom.
>[Drasna]: Dragalge, Druddigon, Mega Ampharos, NoivernUnfortunately, Altaria's Mega Evolution was only introduced in ORAS, so I had to cheat a little with Ampharos.
>[Diantha]: Hawlucha, Azumarill, Aurorus, Gourgeist, Goodra, Mega GardevoirAzumarill cuts down on overlap, while also further showing off Pokemon whose types changed in this gen.