Have we ever seen what ghost types that posses objects look like naturally ? Like honedges before finding a sword? Are they just ghost types we already know about, like a haunter for example ?
it really depends on the pokemon! for the most part, they aren't pokemon until they take over whatever object they're holding. they're spirits, often either of people that died unsatisfied or of intense emotions that manifest physically. the main exception to this is banette, which only truly forms into a pokemon when a doll filled with resentful energy attracts a shuppet, which then merges with the energy.
sometimes the energy these spirits give off can be seen as colorful bits of light called wisps, but to be honest it's rare to actually catch sight of them in this state.
