Dugtrio (PT) Sinkhole Poke-BODY

[AzNightmare]

Reference:
http://pokegym.net/gallery/showimage.php?i=42254&c=198

Is this Poke-Body stackable?
As in if I had 3 Dugtrios, my opponent receives 6 damage counters when his active retreats?

And for Dugtrio's first attack, Push Down, would this trigger "Sinkhole" Poke-Body, effectively doing 50 damage instead of 30? Or no?

[pandem]

1. Yes it stacks.
2. Your opponent would switch but not retreat so it wouldnt trigger the body.