The fastest way to hatch pokemon currently is to use the following method: Have a Pokemon with Flame Body in the party, find a long route or city to bike through like Lumiose City (bike around Prism Tower), and use the Hatching O-Power. The Hatching O-Power can be upgraded by using it multiple times and the highest level it can reach is 3 and at that level hatching eggs is very easy.
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Play another game or try collected all pokemon (mewto)
There is absolutely no way to hatch it.
There isn't a way to make it hatch fast, but the best way is to put the egg first in your party. It doesn't walk with you, the Pokemon who you put 2nd in the party will but it's a pretty fast way to hatch an egg though.
Here’s the fastest way to hatch any Egg: Keep the Egg in your party at all times (or else it won’t hatch at all). Switch your Acro Bike for a Mach Bike at Rydel’s Cycles in Mauville. Put a Pokémon with the ability Flame Body or Magma Armor on your team to halve the number of steps required to hatch the Egg. Zoom around on your Mach Bike until the Egg hatches.
Go to any bike road and ride up and down. If you do it for 5-7 minutes, your pokemon will soon hatch.