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I meant once he starts the process to do it as quickly as possible, not cutting corners of course. Also if he's transferring all rock, sand, etc... there shouldn't be a cycle if done properly and no extra bioload is added right away. I just did it in July and I think it's the last time but went from a 90g replaced by a 180g.What do you have stocked in your current build?
You're certainly going to experience a cycle in your new tank. You can reduce or eliminate this period by utilizing your substrate and/or live rock from your current setup, but take care to wash your substrate first in tap water. I'd certainly get an ammonia badge for your new tank so you can be alerted to any spike in levels if you're not running some type of sensor like a Seneye. I doubt you'll have enough substrate (if you have any) in your old tank for the new one, so you'll have to add some new sand.
I'm also going to disagree somewhat with the suggestion that you proceed quickly and, instead, proceed with caution. Wait until the new tank cycles fully before putting anything in it. And keep that old 10g tank for a quarantine or hospital tank. The worst thing that you can do is move everything over, experience an ammonia spike, and then lose everything.