Lets be generous and assume there will be 100 Galar Pokemon and that there will be a total of 500 Pokemon in the games at max.

Which old Pokemon would you cut?
Only 400 old gen1 - gen7 mons are allowed to stay in. Alternate forms can stay too, they dont add up to the total.

You can use this or the following template, or just write some down which you would cut. Ignore those that are already confirmed if you have too, this is just about your opinion.