I don't know if I should post this here or Anime Polls and I couldn't find any tread on this subject but what are some of the Pokemon you wished Ash could have caught on his journey and why. No main legendaries. "Low-tier" and "Mid-tier" legendaries such as bird trio, Latias and Latios are allowed. (basically the ones that could have multiples of them)
I personally would've wanted him to have caught a Lucario (big aura fan) mainly to delve a little more on the aura topic. Latias too because of their strong connection—mainly Latias' affection to Ash. These two are movie based I know, (though Riley introduced aura in the anime) however, one can only dream.