The Island

Pokéballs are still quite effective even into the endgame. In fact, ever since the games introduced the "critical capture" that randomly makes standard Pokéballs more effective based on the number of Pokémon you've caught, I've pretty much ONLY used standard Pokéballs. As a bonus, buying them in bulk gets you a nice supply of Premier Balls, which I save for shiny Pokémon I encounter.

Pokéballs are still quite effective even into the endgame. In fact, ever since the games introduced the "critical capture" that randomly makes standard Pokéballs more effective based on the number of Pokémon you've caught, I've pretty much ONLY used standard Pokéballs. As a bonus, buying them in bulk gets you a nice supply of Premier Balls, which I save for shiny Pokémon I encounter.

I wasn't aware of critical capture being a thing in the games. What game introduced this? X and Y, or one of the earlier games?

 

Regardless, this does make sense for me to catch Mewtwo with a Pokeball, since I have two and half boxes full of Pokemon in my PC.

Crit. Capture was introduced in Black 2/White 2, I think. Or B/W

 

One of those two.

 

I could have sworn critical captures were simply random chance, not something that increased over time, though...