Onyx Tanuki
Ma! There's a weird 'nuki in the yahd!
Now you've gone pretty much the complete opposite direction, having replaced nearly all of your special attackers with physical attackers. The point is to make sure you're able to handle threats from both fronts. That's why I made such a to-do about Gardevoir having Psyshock over Psychic; it makes it capable of hitting things that are weak in either defensive stat effectively, rather than only being good at handling things with lower SpDef. This team could work if you go full-out special offense on Gengar, but otherwise you really only have Hex/Sludge Bomb and Hyper Voice to hit things on the special side. I do think this team is better, I just feel like you need more of a specially offensive presence. Here's what I'd do personally, with one adjustment in the roster:
Blaziken @ Blazikenite
Speed Boost
Jolly
252 Att, 4 Def/SpDef, 252 Speed
- Flare Blitz
- Low Kick/High Jump Kick
- Protect
- Baton Pass
High Jump Kick is a little risky, but is going to be dealing better damage than Low Kick even on most heavy enemies. Protect is there to ensure you get at least one stage of Speed Boost. Since his primary purpose is to pass Speed to your other pokemon, he'll be of most use once you've punched some holes in the opposition, but they may still have speedy threats on their side that you'd lose to if they're allowed to hit first. However, he also acts as a wallbreaker because he has massive power on his own and there's not that many things that resist both Fighting and Fire and have the defenses to stand up to his attacks. You'll have to watch out for things like non-Mega Gyarados, Altaria and Mega Altaria, and Pelipper.
Gengar @ Black Sludge/Choice Specs
Levitate
Timid
4 HP, 252 SpAtt, 252 Speed
- Shadow Ball
- Sludge Bomb/Energy Ball/Dazzling Gleam
- Thunderbolt
- Trick/Will-O-Wisp/Toxic
I chose a more offensive direction for him to go, trading his Hex out for the overall-more-powerful Shadow Ball and giving him Thunderbolt for additional coverage. Sludge Bomb is a good STAB move, but since you're using another means to handle most Fairies now, you could sacrifice it for another coverage option like Energy Ball or Dazzling Gleam; the former will allow the team overall to cover more types, but Dazzling Gleam will give Gengar better personal coverage. The last slot goes to a support move, with Trick able to cripple opposing walls and physical attackers by giving them Gengar's item or one of its two status moves supporting your team by providing residual damage. IMO, the best option would be to go for Trick with Choice Specs.
Mamoswine @ Leftovers
Thick Fat
Adamant/Brave
252 HP, 252 Att, 4 Def/SpDef
- Ice Shard
- Avalanche/Icicle Crash
- Earthquake
- Stealth Rock
Mamo is what you call a "bulky physical" because, while he lacks the speed to crush most of the foes in his wake, he's got enough defensive power to stand up to attacks for several rounds. Leftovers will improve his longevity, and going for Thick Fat will remove his weakness to Fire and make him resistant to Ice; I understand what you were thinking by having him with Snow Cloak and Hail, but none of your team benefits from Hail besides him, so you'd be better off not bothering. Whether you choose Icicle Crash or Avalanche is really a personal preference; Icicle Crash is better if he's got an excellent Speed IV, while he'll do better with Avalanche if you've got a poor Speed IV and/or you've studied up on pokemon speed tiers enough to know at a glance whether an opponent it likely to be faster. You should also use the right nature to match: Adamant will do better with Icicle Crash since it leaves Speed alone, while Brave will work better for Avalanche since it reduces Speed. Stealth Rock is pretty important, since it'll help defend your team against things like Charizard and Talonflame, and will put more damage on things as they switch in, making them much easier to kill.
Sylveon @ Leftovers/Pixie Plate
Pixilate
Bold/Calm
252 HP, 252 Def/SpDef, 4 SpAtt
- Hyper Voice
- Wish
- Heal Bell
- Calm Mind/Substitute/Toxic
While Protect/Wish is a common strategy, it's one I personally am not a fan of, so I opted to replace Protect with either Substitute or Calm Mind. Hyper Voice is STAB, and of course Wish and Heal Bell are there for cleric duty. Substitute works better with Leftovers, Calm nature, and SpDef EVs, but I think Calm Mind is a more interesting option, as it works well with Bold and Def EVs, especially since Sylveon's the only defensive pokemon on your team. If Item Clause is in play, you may be better off holding a Pixie Plate to beef up Hyper Voice's power a little more. Toxic is a decent third option, too, since Sylveon is great at stalling out opposing walls and next to anything that relies a lot on special offense.
Scizor @ Life Orb
Technician
Adamant
4 HP, 252 Att, 252 Speed
- Bug Bite
- Bullet Punch
- Roost
- Swords Dance/U-Turn
If you're going to be using a non-Mega Scizor, there is absolutely zero reason to use X-Scissor over Bug Bite; it has no added effect and ten less power after Technician is considered. Swords Dance is viable since it has the bulk to take a hit while it sets up and has Roost to recover its health, but U-Turn allows it to be a pivot, baiting in pokemon that'd use a Fire move and swapping out for Mamoswine or Blaziken to take the blow.
Now, as much as I was advocating Crawdaunt, he was actually the weakest of the physically offensive pokemon on your revised team; he has good Attack and is pretty scary, but you have two other things that can use priority, and Gengar can ruin enemies that use Eviolite with Trick. Therefore, I opted to replace it with another special user that pairs well with Sylveon:
Magnezone @ Air Balloon/Assault Vest
Analytic
Quiet
252 HP, 4 Def, 252 SpAtt
- Thunderbolt
- Flash Cannon
- Hidden Power [Ice]
- Volt Switch
This guy does very well as a defensive pivot, switching in on opposing pokemon that have physical Steel or Poison attacks they try to use on Sylveon. From there you could either predict a Ground type to switch in and hit them with HP Ice, or use Volt Switch so Magnezone takes a blow in place of what you really wanted in to finish the opponent off. Flash Cannon is also great against the small handful of physically defensive Fairies. Air Balloon will allow Magnezone to actually switch in on a Ground type attack, while Assault Vest will beef up its SpDef and let it potentially survive a Fire attack if you mispredict.
Speed Boost
Jolly
252 Att, 4 Def/SpDef, 252 Speed
- Flare Blitz
- Low Kick/High Jump Kick
- Protect
- Baton Pass
High Jump Kick is a little risky, but is going to be dealing better damage than Low Kick even on most heavy enemies. Protect is there to ensure you get at least one stage of Speed Boost. Since his primary purpose is to pass Speed to your other pokemon, he'll be of most use once you've punched some holes in the opposition, but they may still have speedy threats on their side that you'd lose to if they're allowed to hit first. However, he also acts as a wallbreaker because he has massive power on his own and there's not that many things that resist both Fighting and Fire and have the defenses to stand up to his attacks. You'll have to watch out for things like non-Mega Gyarados, Altaria and Mega Altaria, and Pelipper.
Gengar @ Black Sludge/Choice Specs
Levitate
Timid
4 HP, 252 SpAtt, 252 Speed
- Shadow Ball
- Sludge Bomb/Energy Ball/Dazzling Gleam
- Thunderbolt
- Trick/Will-O-Wisp/Toxic
I chose a more offensive direction for him to go, trading his Hex out for the overall-more-powerful Shadow Ball and giving him Thunderbolt for additional coverage. Sludge Bomb is a good STAB move, but since you're using another means to handle most Fairies now, you could sacrifice it for another coverage option like Energy Ball or Dazzling Gleam; the former will allow the team overall to cover more types, but Dazzling Gleam will give Gengar better personal coverage. The last slot goes to a support move, with Trick able to cripple opposing walls and physical attackers by giving them Gengar's item or one of its two status moves supporting your team by providing residual damage. IMO, the best option would be to go for Trick with Choice Specs.
Mamoswine @ Leftovers
Thick Fat
Adamant/Brave
252 HP, 252 Att, 4 Def/SpDef
- Ice Shard
- Avalanche/Icicle Crash
- Earthquake
- Stealth Rock
Mamo is what you call a "bulky physical" because, while he lacks the speed to crush most of the foes in his wake, he's got enough defensive power to stand up to attacks for several rounds. Leftovers will improve his longevity, and going for Thick Fat will remove his weakness to Fire and make him resistant to Ice; I understand what you were thinking by having him with Snow Cloak and Hail, but none of your team benefits from Hail besides him, so you'd be better off not bothering. Whether you choose Icicle Crash or Avalanche is really a personal preference; Icicle Crash is better if he's got an excellent Speed IV, while he'll do better with Avalanche if you've got a poor Speed IV and/or you've studied up on pokemon speed tiers enough to know at a glance whether an opponent it likely to be faster. You should also use the right nature to match: Adamant will do better with Icicle Crash since it leaves Speed alone, while Brave will work better for Avalanche since it reduces Speed. Stealth Rock is pretty important, since it'll help defend your team against things like Charizard and Talonflame, and will put more damage on things as they switch in, making them much easier to kill.
Sylveon @ Leftovers/Pixie Plate
Pixilate
Bold/Calm
252 HP, 252 Def/SpDef, 4 SpAtt
- Hyper Voice
- Wish
- Heal Bell
- Calm Mind/Substitute/Toxic
While Protect/Wish is a common strategy, it's one I personally am not a fan of, so I opted to replace Protect with either Substitute or Calm Mind. Hyper Voice is STAB, and of course Wish and Heal Bell are there for cleric duty. Substitute works better with Leftovers, Calm nature, and SpDef EVs, but I think Calm Mind is a more interesting option, as it works well with Bold and Def EVs, especially since Sylveon's the only defensive pokemon on your team. If Item Clause is in play, you may be better off holding a Pixie Plate to beef up Hyper Voice's power a little more. Toxic is a decent third option, too, since Sylveon is great at stalling out opposing walls and next to anything that relies a lot on special offense.
Scizor @ Life Orb
Technician
Adamant
4 HP, 252 Att, 252 Speed
- Bug Bite
- Bullet Punch
- Roost
- Swords Dance/U-Turn
If you're going to be using a non-Mega Scizor, there is absolutely zero reason to use X-Scissor over Bug Bite; it has no added effect and ten less power after Technician is considered. Swords Dance is viable since it has the bulk to take a hit while it sets up and has Roost to recover its health, but U-Turn allows it to be a pivot, baiting in pokemon that'd use a Fire move and swapping out for Mamoswine or Blaziken to take the blow.
Now, as much as I was advocating Crawdaunt, he was actually the weakest of the physically offensive pokemon on your revised team; he has good Attack and is pretty scary, but you have two other things that can use priority, and Gengar can ruin enemies that use Eviolite with Trick. Therefore, I opted to replace it with another special user that pairs well with Sylveon:
Magnezone @ Air Balloon/Assault Vest
Analytic
Quiet
252 HP, 4 Def, 252 SpAtt
- Thunderbolt
- Flash Cannon
- Hidden Power [Ice]
- Volt Switch
This guy does very well as a defensive pivot, switching in on opposing pokemon that have physical Steel or Poison attacks they try to use on Sylveon. From there you could either predict a Ground type to switch in and hit them with HP Ice, or use Volt Switch so Magnezone takes a blow in place of what you really wanted in to finish the opponent off. Flash Cannon is also great against the small handful of physically defensive Fairies. Air Balloon will allow Magnezone to actually switch in on a Ground type attack, while Assault Vest will beef up its SpDef and let it potentially survive a Fire attack if you mispredict.
I think aside from keeping things too far on one side of the offensive spectrum (between physical or special), your biggest problem is team synergy. Many of them seem to be geared to work alone, not considering what they'll do for the other members of their team. Mamoswine is a prime example: you had him using Hail to exploit his Snow Cloak, but the fact is Hail is more of a harmful thing for your team. You need to build the team around one or two pokemon you really want to use, supporting those pokemons' weak points, or else work with a particular gimmick in mind and set your team up to handle things that could counter that gimmick.
I do remember when I used to run it on Showdown it was pretty damned difficult to kill. Then, it was part of a UU Sand team, basically the team's answer to Water types, and I ran a physical variant with Bullet Seed and Rock Slide IIRC. Swords Dance would be an awesome variant, too, since it has the bulk to set up and Recover to keep from being smooshed too quickly. I may have actually tried ingrain on it, though on that tier that made it really vulnerable to Steel and Fighting types switching in on it, so more trouble than it's worth. Also keep in mind that it can also use Stockpile, if you want to go REALLY defensive.