I can't find "Devastating Charge" as an official Magic: The Gathering keyword or ability. It may be a custom card, a card from a non-MTG game, or a misremembered name.
A few possibilities you might mean: Charge isn't a standard keyword either, but Battle Cry (an attacking creature gives other attackers +1/+0) or Trample (excess combat damage carries over to the player) are common combat-aggression mechanics that "devastating charge" might describe.
If you can share the exact card or where you saw this term, I can give you an accurate breakdown of how it works, the rules nuances, and its Commander relevance. I'd rather not invent rules for an ability I can't verify, since that could cost you a game. What's the source or card name?