100 Atk EVs and life orb OHKOes blissey after 2 layers of spikes. You also only need 244 speed to beat lati twins so your spread for rain set should be
100/160/244
or
12/252/244
mixed only though you should dump the extra 12 EVs in defenses or HP, with maybe 4 to outrun bulky starmies which will hit pretty hard with scald.
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