With the quick skeleton I created yesterday, ChompTina runs a baby Koko or two, which helps against the Lost March matchup. You also make it seem like Lost March has absolutely no setup required, and while that setup is very explosive and not too difficult to get going, it's still incorrect. While Malamar does have a lot of combo pieces required, they aren't hard to get set up, much like Lost March. Prize trading with Giratina isn't impossible. So yes, Ultra Necrozma does have the better matchup against Lost March, but your matchup against 2/3 prize attackers is better than Ultras. Pros and cons.