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Lysandre was a great villain. He was probably poorly presented, but he was the best we've had.
The guy is a philantrophist with genuine concern about the future of the world and resource sustainability. He is also an elitist eugenecist and contributed a lot to society. He is right that some people take without giving anything, and he is tired of that injustice.
So he tries to use the Ultimate Weapon, the weapon designed by his ancestors, the ancient people in his region to solve conflicts, to eliminate all the scum.
He managed to activate it, with the help of the elite members of society financing the project, and various partisans including even an Elite 4 member. Pure elitism. His goal was to have a just world without social stains. Where only the best quality people share the resources. That's what he calls a beautiful world.
He was consequent in his intentions and very Hitler-like. Unlike Ghetsis who secretely just wanted to monopolize pokémon, he was true to his ideal. Unlike Giovanni who needs to do crime to get moeny he does it through his business and diplomacy. Unlike Maxie/Archie his goal is based on real needs. Unlike Cyrus he is not an autist, just an elitist.
The sustainability issues were never addressed by those who defeated him. And none of the Kalos heroes contributed as much as him to science, research and Politics.