Really? People are saying these are going to be underwhelming? Are you kidding me? They're not going to be underwhelming, they're going to be banned.
Latias has 80/120/150 bulk with immunities or resistances to Groud, Fighting, Water and Fire. Oh, and it has 110 speed and 140 spatk. And reliable recovery.
Here's the set I'm thinking
Latias-Mega (F) @ Latiasite
Ability: Levitate
EVs: 252 Def / 248 HP / 8 SAtk
Bold Nature
- Substitute
- Roost
- Calm Mind
- Dragon Pulse / Psyshock
Everyone is talking about this thing running two attacks, but that would be wasting how absolutely amazing this thing can be under a sub. Set up a sub on a wall, get 1 cm up, and sweep. Wanna know just how unbreakable this things sub is? Take a look at this
252+ SpA Aegislash-Blade Flash Cannon vs. +1 252 HP / 0 SpD Mega Latias: 76-90 (20.8 - 24.7%) -- guaranteed 5HKO
A 120 POWER NEUTRALLY EFFECTIVE MOVE COMING OFF 438 SPECIAL ATTACK DOES.NOT.BREAK.THE.SUB. Oh, and for comparison
252+ SpA Aegislash-Blade Flash Cannon vs. 252 HP / 4 SpD Blissey: 123-145 (17.2 - 20.3%) -- possible 7HKO after Leftovers recovery
Yeah, Blissey takes 3% less damage. Fucking Blissey.
Now I realize that Aegi would normally use Shadow Ball in this instance (which still doesn't even do half), but I just wanted to showcase the immense bulk that is Mega-Latias. Now the problem with this set is that you're going to be completely walled by either Fairies or Darks. Well, you have 5 other teammates for that. The win condition for Latias is literally "Get rid of Dark types/Fairy types and win". Now you can also run both attacks with no sub, that's perfectly fine, but I think that super bulky sub is just too good to pass up.
Latios is even more broken because it has the Charizard factor where it can run two completely different sets with two completely different counters, and you won't know which one it is until it's too late.
Latios-Mega (M) @ Latiosite
Ability: Levitate
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Draco Meteor
- Surf
- Hidden Power [Fighting]
- Psyshock
Personally, I find this set pretty underwhelming in power and not worth using, but I thought I would mention the wallbreaker set just because it's there. Now the two REALLY dangerous sets are
Latios-Mega (M) @ Latiosite
Ability: Levitate
EVs: 252 Spd / 252 SAtk / 4 HP
Timid Nature
- Calm Mind
- Roost
- Hidden Power [Fighting]
- Psyshock
offensive Calm Mind I see as really threatening. Because you won't know whether it's Calm Mind or Dragon Dance, it'll be pretty easy to set up a Calm Mind when someone switches to what they think is a counter to the DD set, and that could cost them the game. Sure you're walled by Sableye and Spiritomb, but lol Sableye and Spiritomb. And then Dragon Dance
Latios-Mega (M) @ Latiosite
Ability: Levitate
EVs: 252 Spd / 252 Atk / 4 HP
Adamant Nature
- Dragon Dance
- Dragon Claw
- Earthquake
- Roost
The fastest Dragon Dancer in the game. And with 80/100/120 bulk too. And reliable recovery. What more could be better? Only walled by Togekiss, but lol Togekiss.
So yeah, these things are going to be banned. Prepare your anuses when they come out.