Use a Pokemon with the ability magma armor or flame body
(Slugma's ability usually)
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You can't make the eggs hatch faster, but you can play Pokemon Crystal Version on the Nintendo 64 with Pokemon Stadium 2 which has an option to increase the gamespeed.
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pokemon that have the abiliti magma armor cammerupt,sluga,and macargo or ar code for quick egg hatch
Put them in your party with Slugma/Marcargo, this pokemon's body heat will warm the egg and make it hatch faster.
No, unfortunately only the abilities Magma Armor and Flame Body halves the number of steps required to hatch an egg in Pokemon Emerald and afterward.