Will the gen 9 legendaries all be in raids in the future or will some be locked behind special research

So I know this is probably not gonna happen for at least 1 or 2 even possibly 3 years but when the gen 9 legendaries are added to the game like for example Ogerpon and terapagos even the paradox legendaries will they be in raids or will some be locked behind research like terapagos or will we be able to catch more than 1 just curious