Going from NU to BL is not even comparable to going from BL to Ubers. And while it's apparently "not recommended" how has something like deoxys-d just as an example, where probably ~95% had NO offensive presence other than(lol) night shade, been banned the past 3 gens? His sets were basically the same thing 9/10 times. And as smashbros said, not like jumping a tier is unheard off. I'm pretty sure gothitelle was NU at the time of her banning and went straight from NU-->BL. That's a bigger jump then BL-->Ubers. I can understand people not wanting it banned but i don't understand how using the (incorrect) arguement of "it's UU it shouldn't get banned" or only pointing out one of it's apparently weaker sets and not giving mention to any of it's other sets. That's one thing all these suspects have: incredible versatility.
Gothitelle was BL in Gen V because Shadow tag which until 9th August wasn't relea. Frisk Gothitelle is technically NU.
About the suspects, for what i learn:
-Lucarionite: Ban. Mega Lucario is too strong for the tier. Has three strong priority options, one of them bypasses other priority moves ike Brave Bird Talonflame.
Physical Lucario: Sweords Dance//Close Combat/Hi Jump Kick//Crunch/Bullet Punch/Extremespeed/Stone Edge/Ice Punch/Earthquake (2 of them)
Special Lucario: Nasty Plot//Aura Sphere//Vaccum Wave/Focus Blast/Dark Pulse/Shadow Ball/Flash Cannon/Psychic/Dragon Pulse
And there are options liked Mixed Lucario, 4 Attack Physical, 4 Attacks Special.
-Genesect: Ban. Genesect is the msot powerful U-turn users which has a 120 Base Attack, and can have a Download boost or even being EV'd in Attack.
Genesect has various sets: Choice Scarf, Shift Gear Physical, Choice Band, Choice Specs. His movepool consists of Shift Gear, Blaze Kick, Extremespeed (only learned for Red Genesect), Hone Claws, Magic Coat, Rock Polish, Thunder Wave, Reflect, Light Screen, U-turn, Flamethrower, Thunderbolt, Ice Beam, Bug Buzz, Flash Cannon, Energy Ball, Dark Pulse X-Scissor, Iron Head, Shadow Claw.
Deoxys-S: OU. It's very underrated but deserves no ban. It's LO set is manageable by various pokemon that are not weak by some of his common attacks and has acceptable defense to take a Psycho Boost (and if they surivve, his SpA gets murdered). In that aspect, Deoxys-S is like Talonflame, with Flying priority in exchange of a bit lower speed (but very high nonetheless).
As a hazard setters, it's almost guaranteed to get a hazard unless you use Prankster Taunt or a Magic Bouncer only if you use it as a lead. Even though no Defog can switch directly into it because a high risk of Taunt, it can get killed easily and remove the hazards when it's down. Or put yopur own Stealth Rock, using Rapid Spin like MBlastoise, Starmie, Forretress, Tentacruel, Donphan, Avallug, Hitmontop, and specially Excadrill, for what I remember. And various Defoggers like Charizard (rare), Aerodactyl (rare), Articuno (gimmicky), Zapdos, Moltres, Dragonite (uncommon but effective), Mew (uncommon), Crobat (uncommon), Scizor (uncommon), Skarmory, Flygon (uncommone), Salamence (rare), Latias, Latios (uncommon), Empoleon, Staraptor (rare), Honchkrow (Rare), Togekiss (uncommon), Yanmega (rare), Gliscor (uncommon), Braviary (uncommon), Mandibuzz (the most common).
Exist another alternative, trying to switch less, put moves like Bug Bite Scizor, (Bug Buzz genesect), avoid using Choice items and use LO + 4 Attacks if they're fragile, Expert Belt `4 Attacks if they have a lot of supper effective coverage, and Leftovers/Assault Vest/Lum Berry + 4 Attacks if they are sturdy, putting sets like
Rotom-W@Leftovers/Chesto Berry
Ability: Levitate: Nature: Bold
Ev: 252 Hp 132 Def, 128 SpA Moves
Thunderbolt
Hydro Pump
Will-o-wisp
Pain Split/Rest/Volt Switch.