Antiyonder
Overlord
Whether it was perfect or not, one thing that gives the Sinnoh League a bragging right is that all but the last match had Ash fighting against characters that appear throughout DP as opposed to introducing new trainers (Johto was taking a small step in the right direction though by having Gary as an opponent).
And really doing so arguably makes sense as:
1. It gives the match more of a hype to it.
2. In a series this long, why go to the trouble of introducing another character we might not see again when we can get more milage out of some previous characters?
Heck, with the Indigo League they couldn't even come up with some distinctive opponents for Ash's second and third match (therefore compressing them severely), so bringing in someone like the Samurai, Giselle or AJ would have made for a great improvement.
And really doing so arguably makes sense as:
1. It gives the match more of a hype to it.
2. In a series this long, why go to the trouble of introducing another character we might not see again when we can get more milage out of some previous characters?
Heck, with the Indigo League they couldn't even come up with some distinctive opponents for Ash's second and third match (therefore compressing them severely), so bringing in someone like the Samurai, Giselle or AJ would have made for a great improvement.