Tackle is a Light physical move. While this has been called an 'old attack' it is still viable as a Ponymon attack since ponies can charge and tackle.
Ponymon who learn this move:
Dumb-Bell - Lvl 15
Y Lily - ??
"A physical attack in which the user charges, full body, into the foe."
DISCLAIMER: More ponies may need to be added upon further expansion.