>>37022776There's no "playing the encounter badly" in LGPE.
You shove as much catch rate enhancing berries down a Pokemon's throat, then use Ultra Balls Exclusively and pray RNG gives you what you want before it runs away.
That's literally all you can do to manipulate the capture rate, at least in games prior to LGPE you could put a Pokemon to Sleep so you could delay the inevitable "X used Struggle!" from taking so long on Pokemon like Legendaries.