In the time finder there's no encounter type for swarm (If there is I must be blind...) so I just pick Wild Pokemon. But on the main window when you generate frames, make sure you have it as swarm. Then, once you find a seed, paste it into researcher and generate frames and look for the target frame. The target frame in Researcher will be +3 of what RNG Reporter tells you (It's usually +4, but for swarms, the Frames are always 1 behind regular seeds. So, if time finder said the target PID is 302, it would actually be 301. 301 + 4 is 305, 302+ 3 is 305. I hope that made sense). Also, for some reason, sync natures are weird for swarms. Some seeds that time finder says are syncable aren't, and some frames that aren't syncable actually are. To find out if a frame is syncable, paste the seed in the main window and make the encounter swarm. Also, when searching seeds, uncheck the sync only box because like I said, some frames that aren't syncable actually are.
Did all of that make sense? :o