Starmie - give it Rapid Spin over Psychic, at least giving you the ability to fight back against spikers. Halts Skarmory dead in it's tracks, since Toxic won't work for long (Natural Cure), and you have Thunderbolt to take out that metal bird. Leftovers over Lum Berry please.
Swampert: Curse is the order of the day here:
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EV: HP, Att, minor Sp Att, minor Sp Def
Nature: + Att, - Speed
Curse
Earthquake
Rest
Surf/Ice Beam
Mixed Cursepert covers a lot of types.
Ludicolo - Rain Dish is useless, throw it away for Swift Swim:
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EV: minor HP, Sp Att, Speed
Nature: + Sp Att, - Att
Rain Dance
Surf/Hydro Pump
Ice Beam/Leech Seed
Giga Drain/HP Grass/Toxic
Gyarados - standard. Leftovers over Salac, or maybe Liechi, not like he needs the extra speed
Lapras - you are joking, right?
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EV: HP, Sp Att, Sp Def, minor Def
Nature: + Sp Att, - Att
Surf/Hydro Pump
Ice Beam
Thunderbolt/Thunder
Roar/Confuse Ray/Rest
You have no idea how annoying a roaring Lapras can be until you face one. Thunder to go with Rain Dance from someone for Thunderdancing, otherwise it's fairly standard.
Vaporeon - I'd consider Wish for this team:
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EV: HP, Def, Sp Att, minor Sp Def
Nature: + Def/Sp Def, - Att
Surf
Toxic
Haze
Wish
I'm surprised at the lack of Lanturn for electric protection, or some Swift Swimmers like Omastar (forget Kingdra). Considering your lack of physical attackers, perhaps Kabutops may help somewhere.