The obvious wall-breaker of choice:
4 HP/252 SpA/252 Spe
• Draco Meteor
• Hidden Power Fire/Thunderbolt
You may be wondering why I used his back sprite. Well, it's because that's what your walls will be kissing when Latios is done with you. This guy is dripping with pure, destructive power. His base 130 SpA augmented by Choice Specs is capable of shutting down plenty of walls. Common special walls like Blissey/Chansey/Jellicent can all be stopped by Tricking Choice Specs onto them, or by Psyshock and Thunderbolt respectively. Anything that isn't a Steel Type or a pink blob will be decimated by Specs Draco Meteor, and the Steels are mostly KO'd by Hidden Power Fire. His speed also makes him a decent revenge killer, being able to outspeed things like Terrakion, and Keldeo, meaning he is multi-purposed as well and can function well against Hyper Offensive teams as well. If you opt to use Trick, then you can lead with him against Deoxys-D and lock him into Stealth Rock. Point is, Latios is a monster and is one of the best wall breakers in the game.