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yes, you should invest speed evs into exploud. xy has rotom-w, mandibuzz, and mega venusaur, all of which are faster than you, but generally invest little or no speed, so you can outspeed them with investment. if you're using sub/protect on scolipede you can basically get as many speed boosts as you need (unless your opponent bring a roar/whirlwind user, but then you're not getting off the pass anyways), so no, the speed evs would not be necessary there, but i would still use speed evs since you really shouldn't rely on getting the speed pass.
