Capture Power 3 multiplies the catch rate by 1.3 (there's no sense in using the lower level powers since they're weaker, so you may as well grind your Capture Power to level 3 before attempting any SRs). You would just have to activate the power after each reset, before interacting with the Pokemon. It does add a bit of time to each reset, but if you're using low catch rate Poke Balls, you're likely saving some time overall per successful capture. I guess it's personal preference whether you want to spend the extra effort to do that or not (IMO it's worth it). Just add a note that you can't use O-powers in Groudon/Kyogre's room in the Cave of Origin, so you have to save in the previous room.Thanks, I thought someone mentioned the O-Power before, haven't added that yet. I have no clue how the O-Powers work exactly since I just couldn't be bothered, but I will check it out and add it to the guide!
Also, minor nitpick here, but in a lot of the Pokemon's writeups you say something like "if it survives Final Gambit, confirmed 31 in HP". A lot of the Pokemon are low enough leveled that it could be 30 or 31 with the same stat. You did mention this somewhere else in your post, but I think for the sake of clarity you should reword it to say like "if it survives, potential 31 in HP".