I suggest using modest for more power.Choice scarf kyorge will outspeed everything but other choice scarfers but even then with timid he won't be able to outspeed any of them.
Kyogre @ Choice Scarf
EVs: 4 HP / 252 SpA / 252 Spe
- Water Spout
- Ice Beam
Equipped with a Choice Scarf, Kyogre gains the Speed it needs to be a powerful revenge killer and late-game cleaner. Water Spout is immensely powerful at full health, outdamaging even super effective Thunders and Ice Beams. It is Kyogre's main move, and allows it to OHKO many Pokemon that lack a resistance to Water. Surf provides Kyogre with a consistent STAB move unaffected by Kyogre's remaining HP (Water Spout is weaker than Surf when Kyogre is below 60%). As an alternative to Surf, Kyogre can use Scald, which is weaker but occasionally punishes opposing Pokemon with a burn, or Hydro Pump, which has greater power, but an unreliable 80% accuracy.Thunder gives Kyogre coverage against Flying-types and its fellow Water-types. It has perfect accuracy in the rain and a 30% paralysis rate, which can cripple switch-ins. Ice Beam rounds out Kyogre's coverage, hitting Grass- and Dragon-types super effectively. - Smogon