Kyogre is 4th best against M2 in the rain, behind just Tyranitar, Mew2 himself, and Scizor. He hops right over Houndoom when the rain starts.
Also of note: a team of Tyranitar isn't quite as hot if M2 has Focus Blast. In that case, you'll be glad for the likes of Scizor and Kyogre as well as Groudon and Pinsir (in the rain).
I'd Evolve the 15-12-14 Pupitar and then look at break points for you Tyranitars.