If that's the one you have to get the price to 300,000... just keep upgrading egg value, and upgrade your egg. you'll get it eventually!

A trick I like to use involves using the infinite chickens boost and then you enlarge the button and tap with as many fingers and as fast you can.

upgrade the "hold to hatch" epic research using gold eggs from drones or videos. Definitely not worth paying for, but totally worth upgrading as you get golden eggs for free.