Could somebody please factor leftovers into this
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How many Special Attack EV's does a Calm Venusaur need to @2HKO the standard Meganium with sludge bomb?
None. Calm, 0 SpA Venusaur's Sludge Bomb vs. Bold, 216 HP / 0 SpD Meganium: 54% - 64%
How about Celibi? Would probably need Modest for that :/
Actually, you don't have to go Modest at all.
Calm, 96 SpA Venusaur's Sludge Bomb vs. Bold, 252 HP / 0 SpD Celebi: 53% - 62%
If you mean on your opponent then just subtract 6.25% off of the damage calcs. and you will have your answer.
EDIT: First one is 47.75%-57.75%
Second one is 46.75%-55.75%
I'm guessing that's what you were looking for.