Will 20 rims fit my honda accord 08 and what size tires should fit?

I know 255/35/20 don't fit because I had them on n Damage the tires. The tires were scraping and pilling anytime I run a pothole

The biggest size avaliable on the accord I think is 18" from factory. You may be able to jump up to a 19", maybe 20" if you can get the rims the same width as the originals(I doubt your 20" rims fit the accord, 255/35 is huge for a family sedan).

Either you can find tires that have less profile, or buy new rims that fit the car.

It's bad for the wheel to rub/hit the car when moving, not only could it damage the tire/rim itself, you can also break struts or bend an axle etc.