Defensive Calm Mind Latias
Trait: Levitate
EVs: 252 HP / 228 Def / 28 Spe
Bold Nature (+Def, -Atk)
- Calm Mind
- Roost
- Dragon Pulse
- Substitute
This set has been my personal favourite this generation. The EV spread is already listed in the OU analysis for Latias. Basically this more defensive EV spread makes Latias a better check for the numerous Fighting types in the tier in the early to mid-game, as well as letting her take random unSTABed U-turns, as well as not dying to Pursuits from ScarfTar and Banded Scizor. Towards the late game this set allows Latias to set up on various defensive Pokemon which now cannot break her sturdy Subs. Here are some examples:
0 Atk Careful Jirachi Iron Head vs 252/0 Timid Latias: 25-30%, guaranteed to break sub
0 Atk Careful Jirachi Iron Head vs 252/228 Bold Latias: 18-22%, never breaks sub
0 Atk Relaxed Ferrothorn Gyro Ball vs 252/0 Timid Latias: 39-46%, guaranteed to break sub
0 Atk Relaxed Ferrothorn Gyro Ball vs 252/228 Bold Latias: 21-25%, very small chance to break sub
That's just two examples of where a normal CM Latias would not be able to set up on defensive Pokemon, but with the Defense investment, her Subs are now extremely sturdy. In my opinion the ability to set up on a wider array of defensive threats, check Fighting types better, and survive Pursuits and U-turns more easily is more valuable than being able to outspeed a few random Dragon types, and therefore I believe this set deserves more usage.