a trader came and he's selling a psytrainer for neuroquake and fartskip or something and i only have one colonist that has psychic abilities but i want fartskip on someone else? can any colonist use psytrainers?
Basicly yes,
but the pawn can't use that ability until he got the right level to use it.
Not sure about fartskip (did you watch to many south park maybe ?) but for farskip at example you need to have a level 6.
Basicly yes and no...
A colonists needs the appropriate level psychic link first*. But once they have obtained a psychic link any colonists can use a psitrainer.
The psychic link items are much harder to aquire than the ability trainers are but do come with a "free" ability when used.
Its worth mentioning that dependant on their background they will meditate differently, so if you plan on using multiple casters you may also need to have multiple mediation set ups to accommodate for them. (If you want them to regain at speed).
Edit: * I have a feeling a colonist can use a psitrainer before having a psychic link BUT just learning an ability doesn't let them USE the ability.