Scientific possibility of stationary moons for a writer of fiction I tried to do some research to find an answer for this question before posting this but didn't find anything that I could sink my teeth into.

I was wondering:


if it would be possible for a planet to have a stationary orbit Moon, so only one side of the planet would see the moon ever
what that would do to the oceans and tides of the continent that is on the opposite side of the planet.


Conversely how would oceans and tides be different without the moon?

For my question here I'd like to ask about only the planetary science aspects. For the speculative and hypothetical aspects I can ask a separate question in Worldbuilding SE.
The possibility you mention is feasible if the moon is in the equivalent of a geostationary orbit, where the orbital period of the moon is exactly the rotation period of the planet and it orbits in the equatorial plane of the planet.

Such a moon would always keep the same face to the planet if it were close enough to the planet (which in turn depends on the spin period of the planet) such that its spin is tidally locked to the same orbital period.

The presence of significant tides may be required to keep this configuration stable, without a tidal elongation of both objects it is likely that it would drift away from synchronous rotation. This in turn probably needs the moon to have a significant size/mass compared with the planet.

The tides on such a planet would essentially be "fixed". i.e. the tidal forces would be constant (with the exception of the possibly quite significant tidal forces due to the star it was orbiting). That would nean no water sloshing around due to tides. The "sea level" at point nearest to, and opposite, the moon would be higher than if there were no moon at all.

Something like this has been asked in another Astronomy SE question (Can a natural satellite exist in a geostationary orbit?) and, as pointed out there, Pluto and Charon are an example of the system you are looking for.