As for that last part, I'm wondering why SMOGON feels that these pokemon need suspect testing, and not the community.
Well the council receives and monitors feedback all the time aside from being players themselves and witnessing the metagame firsthand, so when the council announces suspect tests (which do not mean the pokemon in question are gonna be banned anyway), it will do so after careful observation and consultation.
Smogon is a community.
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Alright I'll talk about the pokemon I know intimately (Deo-S finishes too fast in bad so I'll screw him first) then end with MLuca.
Deo-S retains many of his annoying qualities from last gen, he is unpredictable as frak (really the definition of the word), speed demon and that gives it many options EV wise, and cannot be stopped most of the time from doing what it does best and most, laying down hazards. It's movepool is advanced and even the wrong assumption can make you go behind one or two pokemon at no cost for the Deo-S user.
However, a lot of things happened this gen as well, most importantly Defog. As you all know Deo-S isn't the bulkiest pokemon around (slightly giving Alakzam gitters in the annual pokemon anorexia competition), and it's hazard laying set only has one attacking option most of the time, leaving it highly unlikely to being able to lay down hazards again. And unlike gen5, you cannot spinblock Defog, so if the opponent gets only one chance to clear hazards later in the game, your mostly dead Deo-S becomes useless and you lost a slot of a mon with no gain. Not to mention already available excellent spinners such as Drill or pranksters with Taunt such as Thundrus-I.
Second of all, the meta has shifted to bulkier, more sturdy mons that don't lose anything bite but are much harder to kill, and even get the advantage of priorities. Well you might gain the surprise factor and use it to your advantage, the opponent will not waste anytime to send his response once your cards are revealed.
I now consider Deo-S a high risk, high reward pokemon, and depends highly on the players skill and ability to keep offensive pressure/switching opportunities to keep him alive/hazards on field.
Deo-S for me isn't uber material but I think it will hang on to lower OU usage and find it's suitable playstyle and stick with it.
Genesect is bloody annoying, you don't know what it has or going to do (it has U-Turn which often gets boosted to mask this) and most of the time it's items don't have telling signs until after much confrontation. It has an acceptable speed tier which makes it's scarf set good (in a meta where scarfs are almost dying), no need to boost as Download often preys on the weaker side of the foe, and great boosting moves such as RP and Shift Gear as well as having an extensive movepool to hit hard on everything SE or not with much force.
How do you deal with this thing? Well until you know what it is, you just send out your bulkiest option, ones that don't fear it that much and hope it actually attacks you instead of U-Turning out, or have a scarfer of your own, or a prankster, it's not unreasonable to say that you suffer quite a bit in this thinking process, it's not a matter of "what's a great gene anti-lead" as much as its "how do I suffer less and manage to trick it early on". This isn't either healthy for the metagame or fair if you can find a nonsubjective definition for the term in OU,
therefore I'd like to see this banned.
MLuca is the pokemon I will say least about
and will leave an undecided opinion, mainly because I run a certain playstyle and MLuca when not in a position to use CC Super Effectively or at least hit strong with his other coverage move, will suffer heavily whenever it tries to set up against practically any member of an HO team or even Bulky offensive team (BU offense =/= Balance team) where any member can hit it very hard and prey on it's mostly non ev'd, frail bulk.
However, this test concerns all teams, and as such his options to boost are wide and readily available and the fact that he gets 112 Speed is very annoying and his Adaptability powering a 120 Fight move and a priority that already nukes it main resistor has to be taken into account, and he gets both the stats and the boosting moves/movepools to play SpA or ATK with immediate power and as such is unpredictable and any prediction about the wall you send against it or check/counter can spell your end. I'm sitting this one out and will base my opinion of this mon on other posts whenever I finish my suspect reqs,thanks.