For Ballet, we tend to have anywhere from 2-3 spots for all shows. Since we archive all previous calling scripts (we don't use scores, we write down choreography), some shows had the ASM call the Spots, while the PSM called deck and LX.
When I work in "regular" theater, the ALD creates the spot cue sheets, and depending on the venue, the spots are either self-controlled, or run through the board. In the case where they are run through the board, I do standby/call everything for them - even if they remember on their own - because they are not controlling when their spots goes on or off.
For the ballet, I do all spots cues/paperwork. I watch the video from the last performance, I take the old SM cue sheets and I start typing. I have a very specific design for the cue sheets, as our ME/Spot 1 and I worked on designing what will work best for her and her team. Sometimes the LD fails to give me the frames, etc - so those spots are blank on the sheet, and they fill in the info with pencil during tech. The spots I work with are awesome, veteran IA spot ops, and they have the cue sheets on music stands in front of them to follow along as we go. Aside from Nutcracker, which has had the same 3 spots ops for the past 7 years, I call all spots. Generally our ballets only go for 4 performances, so the ops don't have enough time to learn the ballet in that time, so i give all standbys and "necessary" go cues. My ME/Spot 1 is the fastest to learn, and generally by show 2 or 3, unless it's a special calling location for a cue, I stop calling her cues altogether (per her request).
By "necessary" cues - I will give the standby "Standby Spot 2 to pick up Juliet entering through the SL Door." The spot is set and when they see the door open, they pick her up. I don't need to call spot outs, as that is pretty obvious - unless the spot out is someplace other than an exit. My cue sheets list the color of costume, and for the tricky pick ups, I will reiterate the color of the costume during the standby.
Though in the theater I work in the most, our Spots also have a private channel - as our ME/Spot 1 will give correction notes to Spot 2 & 3 as we're going along. I tell them what to do, and she corrects from there, so that I can concentrate on the rest of the show.