MetalGarurumon japanese review:
http://d.hatena.ne.jp/UNOYO/20180120/p1It says that the transformation joints are really smooth so it's way easier to transform than WarGreymon, good to know.
In fact, you can see some guy transforming most of it with a single hand here:
https://www.youtube.com/watch?v=mrMZ-zLid98