There is St Nicolaus parish in Krostkowo where all the records of Rzeskowo ( actually Rzeszkowo) suppose to be. Even if not there then probably in Bydgoszcz Diocesan Archive. Are there any particular documents/ information you would like to obtain? I'm sure I could help you just need to know a few more details.
Please write me on: firstname.lastname@example.org
Good luck in your research anyway,