Let’s see:
-Arguably best female character in terms of development
-Said character is treated as a main character just as much as Ash
-Ash’s constantly working on improving his battle skills (Starvia’s Brave Bird, Turtwig’s Energy Ball, Buizel’s Ice Punch, Gible’s Draco Meteor, Gliscor’s X Scissor/learning how to glide, Infernape’s Blaze, Counter Shield, Ice Aqua Jet, the spin from Oreburgh) just to name some
-Inferape’s storyline
-Paul (albeit controversial)
-Galactic was decent and definitely better than Magma, Aqua, and Plasma’s subplots
-Great use of real techniques like Trick Room
-Ash making his best league placement for the time
-Great continuity
DP is most definitely overrated but it has reasoning to