This is my first time attempting the Battle Frontier, can you guys let me know if this team works before I commit to EV training?

>Latios (M) @ Yache Berry
>Ability: Levitate
>EVs: 4 HP / 252 SpA / 252 Spe
>Timid Nature
>Draco Meteor
>Grass Knot
>Thunder
>Recover

>Suicune @ Leftovers
>Ability: Pressure
>EVs: 252 SpA / 4 SpD / 252 Spe
>Timid Nature
>Calm Mind
>Ice Beam
>Surf
>Hydro Pump

Snorlax @ Chesto Berry
Ability: Thick Fat
EVs: 188 HP / 104 Def / 216 SpD
Careful Nature
>Curse
>Return
>Crunch
>Rest