It is a very solid and very effective Stall Hail, ,a style of game that I like a lot but that is impossible in bw2 OU with big sweepers as Landorus-T(Landorus Sheer Force)/Tornadus-T/Thundurus-T/Keldeo..., then I see that your team is disadvantaged against Tornadus-T, Tornadus-T 2HKO Ferrothorn with Hurricane and Kyurem-B/Jellicent also, the opponent can switch if you put Abomasnow or Mamoswine. But I know that you want to keep Ferrothorn for Spikes and I see that you are very disadvantaged against Scizor Bander because even if Jellicent is a ghost-type Pokémon. It can not tank the Scizor Bander's Uturn correctly, it has 4 ev in defense, it is not enough (252 + Atk Choice Band Scizor U-turn vs. 252 HP / 4 Def Jellicent: 126-148 (31.18 - 36.63%) - guaranteed 4HKO) and if the opponent puts a grass or electric-type Pokémon it can force you to switch, and then after 4 Uturn (3 If Stealth Rock) Jellicent can not come to Tank ,I suggest you to Forretress on Ferrothorn , Forretress can come on Uturn's Scizor and can tank his attacks, then it is a good spinner and it is your only counter to Terrakion Bander, Mamoswine is outspeed and the opponent can anticipate focus sash, Jellicent is OHKO with Stealth Rock.
But now that you have a rapid spinnerr you can remove Starmie, I see that you are very disadvantage against Reuniclus because Kyurem-B cannot kill him with Outrage (116 Atk Kyurem - B contempt vs. 252 HP / 252 + Def Reuniclus: 192-226 (45.28 - 53.3%) - 0.39% chance to 2HKO)
I suggest you to Jirachi Specially Defensiv, Jirachi is a good very good pokemon for your team, it can come on Reuniclus for paraliser + Flinch with Iron Head, then it is also a very good counter to Tornadus-T.
And then for Jellicent I suggest you put this distribution for the Ev's
because Jellicent Specially Defensive cannot Lucario tank if it has Crunch, now you can resist and use Will-O-Wisp.
EVs: 252 HP / 184 Def / 72 SDef
Bold Nature (+Def, -Atk)
Hope I Helped and Good Luck with your team.