Haha. No, you cannot. You can stop evolution— there are reasons to. Sometimes a Pokemon does not want to change drastically, sometimes the new shape is more unwieldy than the previous, sometimes it means they might forget, sometimes they just want to stay as they are. But you cannot stop time from passing and you cannot help growing up. Moveset wise ... This will also not help you, but. Not all young Pokemon of the same species will know the exact same things as each other, either.

[ you are coming dangerously close to the Pokémon breeder special interest, Emporio. ]

As for your other question. Ghosts can be tricky. A good number of Pokemon do not learn that many non-normal moves early on, and beginner trainers are often warned away from them. [ for multiple reasons, really. ] What do you know how to do, right now? Doesn't have to be something you can put a name to. List them out. Maybe we can think of something.

But if all else fails you can probably just start throwing things. Maybe rocks, or, hm. Boomerangs maybe? Marowak are known for it, with their bone clubs. That said. If an opponent isn't a good match there is no shame in allowing a more suitable partner to cover for you.