I'm not so sure about that, I don't ever use anything except regular pokeballs anymore and have no difficulty catching even legendaries with over half their hp left, been that way since gen v when one of my friends was struggling to catch a legendary (I forget which) as he kept making it faint after wasting a tonne of ultra balls, after he reset I threw a pokeball at it right off the bat and captured, played all of gen vi- x, y and oras with only pokeballs being used as well.
Well, if one wants to only use a specific type of Poke Ball when catching Wimpod, due to its ability False Swipe is a no-go since knocking it below half HP makes it run away. Status inducers really will shine when trying to catch that little guy.