Hey there Hot Sauce, I want to rate your NU team :D looks pretty good, but there's a few changes that I think will make it perform much better. let's go! :3
Shuckle 
Well, I'm not Shuckle's biggest fan (damn it Faked Thrower) but the set looks fine, although Mud-Slap is a pointless move, and you can't really rely on haxing your opponent out to stay alive. Replace it with Stealth Rock - you don't have any hazards on your team, and to be honest, Shuckle has nothing better to do.
Eelektross 
This moveset looks okay. But Electric Gem? That's a bad idea. It's only a one time use, and can be easily wasted. Also, his speed is really poor so there's not much point investing in it. I'd also give him Leftovers for constant healing. Also, his physical movepool isn't great. You have two options - either give him a special set, which I think works better, or change his physical moves a little. Here are two good sets:
Eelektross (M) @ Leftovers
Trait: Levitate
EVs: 252 HP / 252 SAtk / 4 Spd
Modest Nature (+SAtk, -Atk)
- Acid Spray
- Thunderbolt
- Giga Drain
- Flamethrower
Eelektross (M) @ Leftovers
Trait: Levitate
EVs: 252 HP / 96 Atk / 156 SDef / 4 Spd
Careful Nature (+SDef, -SAtk)
- Coil
- Wild Charge
- Drain Punch
- Crunch
Gardevoir 
Looks great, although I prefer a Timid nature. Also, choosing Energy Ball in the last slot leaves you walled by Steel types, so go for Focus Blast or Hidden Power [Fighting] - power vs. accuracy.
Absol 
Not quite sure what you're doing with this guy. The only advantage of Hone Claws over Swords Dance is the accuracy of Stone Edge which isn't a great coverage move anyway. I'd recommend this set:
Absol (M) @ Lum Berry
Trait: Pressure
EVs: 252 Atk / 252 Spd / 4 HP
Adamant Nature (+Atk, -SAtk)
- Swords Dance
- Sucker Punch
- Superpower
- Psycho Cut
Ludicolo 
I see you're going for a sort of staller set here. Well, a Sub-Seeding set fills that role a lot better. For the other slots, you have lots of options. Toxic adds to the residual damage, while Protect helps stall even more. Giga Drain gives you more nice healing, but Scald has a lovely burn chance, and Ice Beam hits Grass types that are immune to Leech Seed.
Ludicolo (M) @ Leftovers
Trait: Rain Dish
EVs: 196 Def / 60 SDef / 252 Spd
Timid Nature (+Spd, -Atk)
- Substitute
- Leech Seed
- Toxic/Protect
- Giga Drain/Scald/Ice Beam
Slaking 
Well, last but not least, Slaking. Giga Impact may seem like a good idea, but its downside is that it forces you to stay in, letting anything come in and set up on your face. Therefore, Return is a better option. Also, replace Sucker Punch with Night Slash, as getting Choice-locked into Sucker Punch is just horrible. Finally, Earthquake outdamages Hammer Arm against Rock and Steel types. Seeing as a SE Ice Punch does the same as neutral Return, the last slot is up for grabs - your other options are Retaliate (JCM's favourite), Pursuit, and Sucker Punch.
...anyway, i'm done, hope I helped xP
