If Marshadow/Raikou ties
(1)Hoopa 8+10
(3)Victini 8+8
(3)Raikou 7+7
(1)Diancie 7+6
(2)Marshadow 7+5
(4)Shaymin 6-4
(4)Regi
(2)Melo

We need 2 of:
-Regi win/tie or our loss + shaymins win is below 14 (if equal we tie Shaymin)
-Melo win or Melo tie and we lose 5-7 or 4-8
-Victini win or tie and we lose 5-7
-Our loss - Raikous win is below 2 (if equal we tie Victini)

Case by case:

We lose 0-12
We need 2 of:
-Regi win/tie or Shaymin 7-5 win (tie with them)
-Victini win
-Raikou 11-1 win (we tie with Victini) or better
-Melo win

We lose 1-11
We need 2 of:
-Regi win/tie or Shaymin 8-4 win (tie with them) or worse
-Victini win
-Raikou 10-2 win (we tie with Victini) or better
-Melo win

We lose 2-10
We need 2 of:
-Regi win/tie or Shaymin 9-3 win (tie with them) or worse
-Victini win
-Raikou 9-3 win (we tie with Victini) or better
-Melo win

We lose 3-9
We need 2 of:
-Regi win/tie or Shaymin 10-2 win (tie with them) or worse
-Victini win
-Raikou 8-4 win (we tie with Victini) or better
-Melo win

We lose 4-8
We need 2 of:
-Regi win/tie or Shaymin 11-1 win (tie with them) or worse
-Victini win
-Raikou 7-5 win (we tie with Victini) or better
-Melo win/tie

We lose 5-7
We need 1 of:
-Regi win/tie or Shaymin 12-0 win (tie with them) or worse
-Melo win