Did the spriteart for the series get worse towards the end? I started noticing a decline in Platinum, when some new sprites like Roselia and Hippowdon had noticeable bordering issues, and then this kept up into HGSS when some pokemon had sprite art that just slightly felt "off". Examples of this would be Poliwhirl, Tangela, and Tentacruel, they didn't really feel dynamic. And then this culminated in Black and White, where many pokemon either had their sprites recycled or like Weaville, had new sprites that weren't nearly as dynamic looking as the old one.

Am I being paranoid? I really think Ruby, Sapphire, and Emerald were the pinnacle of sprite quality for the series.