Acid Armor only sees use on Baton Pass teams. This team isn't Baton Pass from the looks of things. Vaporeon is better off simply Wish-healing the team:
-Wish
-Protect
-Scald
-Ice Beam/Toxic/Roar
Nature: Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Water Absorb
What's the point of Mandibuzz's EV spread? Sometimes the standard spread is the best spread if your EV spread doesn't accomplish anything. If you intend to use Knock Off on it, use an Impish nature, so that Knock Off's power isn't ruined:
-Foul Play
-Roost
-Taunt/Whirlwind
-Knock Off/Defog/Toxic
Nature: Impish/Bold
EVs: 248 HP/252 Def/8 SDef
Item: Leftovers
Ability: Overcoat
The thing I said about Mandibuzz also applies to Goodra. What KOs does it avoid with your spread?:
-Draco Meteor
-Fire Blast
-Thunderbolt/Sludge Bomb
-Focus Blast/Dragon Tail
Nature: Modest/Quiet
EVs: 248 HP/252 SAtk/8 SDef
Item: Choice Specs/Assault Vest
Ability: Gooey/Sap Sipper
Once again, what applies to Mandibuzz and Goodra also applies to Gliscor. The preferred EV spread is 244 HP/40 Def/224 Spe. This lets it outspeed Jolly/Timid Lucario and other base 90 Speed Pokemon.
Thanks for you input. I definitely took some of your suggestions, and can see an improvement.
I was trying pick stuff that would best compliment them for the job I was assigning the particular mon. The only thing is that you didn't answer my main question. Do you think I should switch out Vaporeon for Sylveon with a similar set? Reason I ask, is that right now my team as big weakness toward electric types. I figured Sylveon would help my coverage and overall team synergy.