Sorry :( I was looking through all the seeds I found to see if they would be swarm encounters on the target frame... none of them are so far (Btw this is 5th gen).
Yeah, it's very similar. Do you have any specific questions? You basically just search a seed with min frame 55 max whatever you want, pick an IV spread and search until you find the nature you want. Then hit the seed and advance to your target frame (You advance the frame with Chatot, like a PID frame).