>>36825620>70 new Pokemon>61 after you take away the starters>58 after you take away the box legendary trio>55 after you take away the obligatory 3 mythical Pokemon every gen>53 due to the Meltan line>50 or 49 after you take away the quartet or trio of minor legendariesWe'll probably have around 50 or so non starter/legendary Pokemon to use. If Gens 6 and 7 are anything to go by, the new Pokemon will be rare to find and the rest of the regional dex will be old Pokemon.
We're never going to get a shitload of new Pokemon like in BW since everyone complained about not being able to catch old Pokemon.