Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Even for the Kalos region, all the gym leaders and elite four have trainer sprites for Pokemon Showdown. Why doesn't Lysandre have a sprite?
Source:
https://play.pokemonshowdown.com/sprites/trainers/