>>34589526You didn't specify nature so I'll work around about it.
>PrimarinaFull special tank Goodra
252+ SpA Choice Specs Modest Primarina Moonblast vs. 252 HP / 252+ SpD Assault Vest Calm Goodra: 182-216 (47.3 - 56.2%) -- 79.7% chance to 2HKO
Otherwise
252+ SpA Choice Specs Modest Primarina Moonblast vs. 4 HP / 252 SpD Assault Vest Modest Goodra: 200-236 (62.1 - 73.2%) -- guaranteed 2HKO
>Goodra252+ SpA Modest Goodra Sludge Wave vs. 0 HP / 0 SpD Modest Primarina: 180-212 (59.8 - 70.4%) -- guaranteed 2HKO
However, if against a Primarina with special defense stats invested:
252+ SpA Modest Goodra Sludge Wave vs. 0 HP / 252 SpD Modest Primarina: 146-172 (48.5 - 57.1%) -- 89.8% chance to 2HKO
So yeah, Primarina isn't looking so good in this match up.