Humans are tools
Diamond and pearl should be considered as the golden age of pokemon it succeeded another great series AG and elevated furthur up. DP is by far the best written series in pokemon's history, you can say it is possibly the series with least number of flaws.Not really, Kanto and to a lesser extent Orange Islands were considered the "golden age" of the anime. It's when you get over to Johto most people forget most of the episodes besides the ones that stand out, because a lot of Johto fillers all blend in with each other. And as I said before, Ash's Johto team like Bayleef/Cyndaquil/Totodile/Noctowl just doesn't have the same nostalgia following Ash's Kanto team has. Honestly Ash's Johto pokemon are the forgotten middle child of most of his pokemon teams.