Just look for a Pokemon with flame body ability and then your eggs will hatch.
There is certain number of steps you need to make to hatch an egg. But you need to have an egg in your team.
Put a Pokemon with flame body/magma armor in party and 500 steps
It depends on the egg your hatching, but its usually around 2,000 - 5,000 steps. The fastest way to hatch it is to literally ride on your bike (: -Chii Magmar + Bike your egg will hatch within 5-10 mins.
Walking
yes
It is impossible to hatch an Ivysaur from an egg; therefore, no amount on steps will make eggs hatch an Ivysaur. If you bred with a Venusaur or an Ivysaur correctly, then the egg would instead hatch Bulbasaur.
It depends on the Pokemon that is inside the egg, some Pokemon need more time to hatch. But you can always use Action Replay to make eggs hatch faster.
you can't you must walk around with the egg in your party.
There is certain number of steps you need to make to hatch an egg. But you need to have an egg in your team.
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
Litwick
pokemon that have the abiliti magma armor cammerupt,sluga,and macargo or ar code for quick egg hatch
Put a Pokemon with flame body/magma armor in party and 500 steps
You will need to walk/run/bike a certain number of steps to hatch the egg.
No sadly, they don't. I don't exactly mean by 'hatch eggs' but if you mean make eggs in the daycare centre they don't (we'll you can't clone them.) But some can hatch out off eggs like Riolu. (Devolution of Lucario)
No you cannot. Legendary Pokemon can't breed (make eggs). Not even with Ditto.