Magnezone @ Air Balloon
Ability: Magnet Pull
EVs: 8 HP / 248 Def / 252 Spe
Timid Nature
IVs: 0 Atk
- Body Press
- Iron Defense
- Magnet Rise
- Discharge
Lets go fishing!
Mag traps NDM fairly reliably, and Xerneas's other answers can be dealt with by customising the Xerneas set most of the time. This set will also trap random steel types if your opponent is using a banded Scizor locked into bullet punch or something equally not-used. It wont trap Solgaleo/Magearna, but those two barely exist anyway.