or because mew can cripple/wall the entire fucking metagame barring megadoom and hydrei (and even then hydrei hates getting its item knocked off on the switch).
anyways nido should be moved down to A rank. while it does 2hko a good portion of the tier if not outright ohko'ing, it has a fair few of mons that can counter it fairly easily, like umbreon (don't give me that bullshit argument about focus blast because it has terrible accuracy which lets it wish back up and fb is pretty much pp stalled anyway), mew, cresselia, bronzong(?). it's also incredibly easy to check offensively as it has mediocre bulk, bad defensive typing, and can be outsped by a fair portion of the tier, or some mons like mega blastoise or hippo can tank a hit and ohko back. i'm not sure if queen should be moved down as well though since nidoqueen has solid bulk.
i don't have enough experience with mega absol to give a solid ranking on it, but with what qwilphish has said, and the fact that absol has terrible bulk, i'd go for either A- or even B+ rank.
anyways nido should be moved down to A rank. while it does 2hko a good portion of the tier if not outright ohko'ing, it has a fair few of mons that can counter it fairly easily, like umbreon (don't give me that bullshit argument about focus blast because it has terrible accuracy which lets it wish back up and fb is pretty much pp stalled anyway), mew, cresselia, bronzong(?). it's also incredibly easy to check offensively as it has mediocre bulk, bad defensive typing, and can be outsped by a fair portion of the tier, or some mons like mega blastoise or hippo can tank a hit and ohko back. i'm not sure if queen should be moved down as well though since nidoqueen has solid bulk.
i don't have enough experience with mega absol to give a solid ranking on it, but with what qwilphish has said, and the fact that absol has terrible bulk, i'd go for either A- or even B+ rank.