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Offensive items in gen 3:
Choice Band
White Herb
Uhh the specific type boosting items (which were only a 10% boost at the time)
And that's literally it, enjoy running leftovers or rng shit on literally everything else
Now come gen 4:
Specific type boosting items buffed to 20%
Choice Specs
Choice Scraf
Life Orb
Expert Belt
Wide Lens
Focus Sash allowing you to neglect bulk and not instantly die
Additionally:
Much more hazards to shut down stallshit
Physical/Special split allowing everything to hit stronger
Strong fast mons like Garchomp and Weavile
Strong moves like Close Combat, Brave Bird, Draco Meteor
Strong buffs of old moves like Outrage, Leaf Blade, Fly
...what was it about gen 4 battles being "slow" again? I'm pretty sure the average gen 3 battles takes longer than the average gen 4 one.