Im not even sure if i would consider Junior Cup as World tournament. It hardly gave out impression of global event hosted for participants from all over the world to compete in, like games did gathering gym leaders, E4 members, all kind of high class very skilled trainers opened for everyone. In fact whole conceot of Junior Cup was in least hand underwhelming and insulting n my opinion to something which should had arguably hold high level of honor and recognition turning into biggest, most massive event so far created in pokemon world.
Passing on relatively low note covering it through small provincial like event which had grand total of just 16 participants. To make things even worse only competitors outside the Unova native trainers were Ash and Dawn(not counting hosts like Cynthia or Caitlin) undermining its credibility and importance ending as nothing more than slightly glorified version of Don George Battle Club tournaments reserved mainly for trainers from BW.
One on one battles only further reinforces such kind of impression with most battles being composed of fast forward one KO hits be it Ash battling Marris and Karrablast, Trip defeating Burgundy with one blow, Cilan plowing through Galvantula and Chinchillo like they were joke etc. etc.
So called "World Cup" was perhaps one of biggest let downs and disappointments i had from Unova series. With writers doing terrible adaptation of something so prestigue and diverse games delivered, revealing how unprepared and poorly planned whole concept in anime version was. Resulting in rushed, badly written and anticlimactic arc done mainly to glorify Iris Dragonite which ignored type disadvantage like its completely irrelevant and boost up Trip with attempt of portraying him as threat for league later on.
Failing to deliver that in homogenous and believable manner, given how for most part of BW he was portrayed as rather average trainer who was starting out, just to later reappear with evolved Serpentine dominating opponents left and right in Junior Cup, trying to turn him in threat for league over night and make amends with idol Alder misnderstanding his message of where true stte gth of pokemon trainer lies. . Ending as joke later at that same league being threw out already in first round.
Shame because there were several ways imo to make World tournament more enjoyable, eventful and believable living up to what games established.
There could have been several cups spread across Dekolora islands for example like Senior Cup or Champion cup acting as follow up from Junior tournament opening access toward return of previous gym leaders like lt. Surge, Sabrina, Norman(referencing May and Max that way), Volkner (heck Clair could had be one of participants introducing her in more appropriate way to play part in Iris plot) and possibly give us surprising returns in form of some other notable gym leaders and good long time friends of Ash like Misty. For who going on travel to compete in events on global basis would be justified helping her to advance water master career for which battling in tournaments and meeting other strong trainers from which you could learn is desirable as Whirl Cup showed. Along with helping to promote BW2 games better thanks to iconic status enriching on atmosphere with her rebellious, quirky and joking nature.
Whole Junior Cup as far as im concerned was prime example of rushed and contrived writing and only good thing was lively, dynamic interactions between cast and rivals. Everything else was subpar and disappointing to me.