>>56688829He means Crystal style animations. Emerald, DPPt, and HGSS use two to three frames which are rotated and scaled to give the appearance of an animation whereas BWBW2 breaks up the sprites by body part and then animates them. Crystal used actual animation and they were initially planning on doing Crystal style animations in RS, but they gave up early on because it was too much work to animate almost 400 Pokemon.
Honestly the Crystal animations are more soulful than the Emerald ones, though I do understand why it's not worth the effort.
You can compare here:
https://www.youtube.com/watch?v=JC3uTUvzo0E 
