Lol @ Mini Emp and Pelip being > Tank and Tree.just me nitpicking but skuntank and shiftry are not our main defoggers imo , skuntank can't a majority of the time fit in defog into its move pool because it has 4MSS and would rather run taunt or memento as a 4th move over defog, and shiftry is better at LO 4 attacks or SD and if it wanted to run defog it would have to lose a coverage move. I'd say our main defoggers would have to be peliper and primplup, Pelipper and primplup both have great typing to maintain themselves in the game to be able to take hits and defog because of bulk, eviolite, and roost and can afford to run defog over any other support/offensive move. i preferably like using pelipper over prim cuz of roost and flying stab but primplup does also get SR and roar.
Besides that yeah, i like the post, pretty thourogh and i forgot about competitive so R.I.P
Shiftry does very well with Defog / Knock Off / Sucker / Leaf Storm. Good offensive presence and utility value since many things that can KO it easily fear Sucker Punch (Magmortar, Swellow, Pyroar, Haunter etc). Tank has great utility value as being the supreme counter to the psychics and ghosts that pretty much every team has at least 1 of. It's not perfect at all due to being a little weak and because Rhydon gives its standard set a hard time, but it's much more splashable than mini emp, which kills all momentum, and pelip, which isn't too bad but is weak to rocks.