you carry them along with you. but you have to have energetic Pokemon.
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Any Pokemon can breed with Ditto unless they are legendaries.
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.
Walk with energetic Pokemon Walk with energetic Pokemon
Use a Pokemon with the ability magma armor or flame body (Slugma's ability usually)
legendary Pokemon can not be made into an egg every other Pokemon will be an egg for some reason people say lucario is a legend but it also can make eggs