Assuming IVs are in order of A/D/S I'd pick either 1889 or 1885 after dropping a fast TM on them. If you're looking to max one out for Kyogre they hit their last Thundershock breakpoint at level 38.5. Otherwise it's level 39.5 for the ones with a 14 and level 40 with ones with 13. The one with 12 will never hit it.
Which Raikou to invest in?