Pokémon: Above the Top - Chapter 276: Hypnosis Pendulum’s Might

... to didn't force a capture. He simply turned away with Gengar and left.

The more mature a Pokémon's mind, the harder it is for a Trainer to capture. Even if captured, it takes a lot of time to build mutual trust; and even then, success isn't guaranteed.

Mismagius's natural potential was only at the elite level, and it had no evolutionary prospects. If it weren't for its unique illusionary abilities catching Sato's attention, it wouldn't have met his standards for capture at all. < ...