Yes i did make a copy of version 2.220 zetta and used a file comparer just to see what the changes were for zetta.

Up Special: start up changed from 11 frames to 8 frames

Forward Aerial: normal hitbox changed from 35 width to 55 width and hitbox origin changed accordingly

Dash Attack: Visual effects changed; Normal hitbox damage changed from 6 to 9 and angle changed from 140 to 361; base hitpause changed to 9 and hitpause scaling changed to 0.9

Down Strong: made it connect more reliably by changing the the files modified on opponent. (most likely means weird windbox doesnt happen and connects more reliably)

misc.: removed old comment code from attack_update.gml and adjusted up special to sync with faster startup