So what it is the largest set?? I don't want to be a down-beaten bad mood grumpy commenter here but the truth is can't even finish collecting each set. I have used my strategy to buy every product on each set and always finish my set at 70-80% the rest of the cards that I do miss cost way too expensive if buy separately. What makes the problem even worse than here in Europe getting Pokemon TCG products is way harder, especially if you are coming from Eastern Europe, like me, I am from Latvia. We don't have any official way to buy from store Pokemon products. We got regular guys who buy from other European retailers and then resell that same product more than twice expensive. And even me who buy from other European retailers I constantly face extra costs on shipping and the fact that the same TCG products that cost in the USA cheaper are more expensive here at RRP.
Right now I can try to buy every 3rd set release and even then it will be finished around 80-90% range if lucky.
I do love the artworks from common to secret rares but Pokemon company has to think about how they release these products so people can actually try to finish each set and enjoy collecting cards. Back in old days, it was easier to finish the set for reasonable money spent but now that can't be done. Lost Thunder also was hyped huge set. I have only managed to get about 12 packs total and very similar is with almost every set.