>>57639283It sets up false expectations, then. False advertising, if you will, because there's no clarification on whether or not abilities are appearing in this game. Showing Mega Kangaskhan with its most well-known move that explicitly takes advantage of Parental Bond comes with the implication that abilities are in the game.
If they aren't, and someone assumed as such based on that trailer, and no further footage or screenshots gives us a clear look at a Pokemon's status screen to confirm the presence or absence of abilities, then they could be in hot water for false advertising.