(couldn't get the speed correctly but they should work correctly in Essentials)
All Partner Backsprites from DPPt and HGSS except for the protagonists (Dawn, Lucas, Lyra, Ethan) formatted to work in Essentials.
Related-
Gen 3 Partner Backsprites
I don't know if this would already count as "too much", but animated Team Rocket Grunts sprites in the style of Gen V, as Team Plasma feels a bit off when I try to include Team Rocket trainers