No Asuna in D/P. </fanboy>
Anyway, other than no Asuna, who I don't know if anyone other than myself cares about anymore (Don't go off-topic answering this), I find the Battle Tower the most annoying thing... hacked, I swear. XD Here's how one of my battles went:
Against a Birdkeeper, I bring out Gallade, she brings out Aerodactyl. I switch to Electivire to avoid type advantage, and Aerodactyl uses Iron Head, bringing Electivire down to I think 26 HP. I order Electivire to use Thunderpunch, and then Aerodactyl uses Rock Slide. Critical hit, Electivire KO'ed. So I bring out Porygon-Z. I order it to use Thunderbolt, Aerodactyl uses Rock Slide, critical hit, Porygon-Z down to 5 HP. Porygon-Z uses Thunderbolt, Aerodactyl OHKO'ed. Next up: Honchkrow. I order Porygon-Z to use Thunderbolt. Quick Claw activates, Honchkrow uses Frustration, Porygon-Z KO'ed. I bring out Gallade, order it to use Close Combat. Quick Claw activates, Honchkrow uses Drill Peck, Gallade OHKO'ed, I lose.
If that's not rigged, I don't know what is. Also, I've seen a Froslass once that outspeeds all my Pokemon, and every Ice Fang makes my Pokemon flinch, except twice... one of those times froze my Pokemon instead. XP