Make sure the Pokémon knows a move that causes Sleep, Freeze, or Paralyze. This will help speed up the catching process. Ideally you’ll want a Pokémon that also knows a Bug, Ghost, or Dark attack, as these will be the most effective against Mesprit. False Swipe is also an good move for lowering its health safely, but can take a lot longer. An alternative option is to put a Wobbuffet or Wynaut with the Shadow Tag ability at the front of your party. Shadow Tag can prevent the Mesprit from fleeing. Wobbuffet is much slower than Mesprit, however, and will likely not last long in battle. [1] X Research source

You’ll find one clown next to the Pokémon Center, one in front of the Poketch Company headquarters, and one in front of the TV station.

Roaming Pokémon like Mesprit will change locations every time you move between locations. This can make tracking them down difficult, but there’s a trick you can use to speed it up.

Mesprit’s movements are random, so you may have to go back and forth many times until you’re both in the same spot.

You can use your Master Ball to catch Mesprit instantly, but you may want to save it for other elusive rare Pokémon later.

If you accidentally knock Mesprit out, you’ll need to load your save and try again.

Make sure you don’t knock it out! If you knock out Mesprit, you’ll need to load your saved game and try again.