Two of Lysandre's pokémon have evolved without actual input from him.
The first was his honchkrow — Sébastien is a notable force of chaos in his life as it is. As a murkrow he wasn't much different, just. Smaller. Easier to manage. Lysandre has, in the past, had to keep his personal workshop and certain cabinets locked, as Sébastien will steal anything with even a small amount of sparkle or shine to it and promptly pile it on Lysandre's pillows, because obviously the important shiny things need to go in the nest. Obviously. Humans are kind of idiots for not doing that, he's just looking out for his big dumb human.
This was fine, if a pain to have to clean up after. The trouble is that when you have a murkrow who collects shiny things, and you've bought an evolution stone for him to use later and just happen to leave it where you THINK it's safe but murkrow are much more clever than you think ....
Lysandre came home to a very smug honchkrow in his condo, proudly making an even larger hoard of objects he could now get into. This behavior continues on for some time, escalating to Lysandre having to find better outlets for his mischievous energy.
And then there's his later team. His florges chose to evolve herself rather early as an attempt to better protect him. L had caught her as a flabébé — or, rather, befriended her. He didn't have a pokéball at the time of their first meeting. She simply followed after him, curious, able to sense that there was something up with his life energy.
It's only after he finds some spare pokéballs that he offers to catch her, then helps her get stronger.
Her floette stage is actually the shortest of them all — prior to evolution, she'd been content to simply float along with her fellow fairies, taking her time, but having a team and a trainer to look out for pushed her out of her previous comfort zone. She wanted to be stronger, and that required evolution for her.
By the time Jules the sableye joined the team, she'd already been on the lookout for a stone to help her evolve. She roped Jules into that, setting him out to look for it. Each sparkly rock he brought back was personally inspected by her until a shiny stone was found, at which point she brought L's attention to it.
(It's only polite that Florence let him see her intention — she's evolving to protect him, after all. She didn't ask, just made it clear that she was doing this.)
