You're talking about a plaster skim-coat? Like you would do inside an expensive house so the walls look smooth with no sheetrock joints or nail/screw heads showing? No one does that in a garage AFAIK. Or are you talking about a stucco finish? I have that in mine and I hate it because you can't keep it clean.
As others have said, just use an exterior grade semi-gloss paint and you should be good to go. You might want to put a "chair rail" around the wall if you think you're going to be hitting it with car doors or tool boxes or detailing carts.
Plus, if you bump in to it, road rash (wall rash?) is the word of the day. It can remove skin in a heartbeat.
Are you talking about finishing the drywall with tape and mud so you can paint it and achieve drywall "orange peel"?
On the stucco as others have said just paint it with exterior semi-gloss and you're done.
When I had my house built - I had them use plywood for the garage walls. Best decision i ever made in there. I can hang things where ever i want and dont have to worry about finding studs. I taped and plastered the seams and finished it w/ a white semi-gloss.
I just wish I would have done the floors w/ epoxy or something before we moved it.
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