I call this a Black 2 team but it's mostly made up of my imports from fire red

Kerrigan the Gengar Lv 77
Attack - 139
Defence - 117
Sp Att - :236
Sp Def - 148
Speed - 208
Sludge Bomb, Hypnosis, Nightmare, Dream Eater

Cloud the Jolteon Lv 79
Attack - 130
Defence - 136
Sp Att - :228
Sp Def - 182
Speed - 200
Thunder, Thunderbolt, Thunder Wave, Thunder Fang

Wakka the Vaporeon Lv 77
Attack - 159
Defence - 130
Sp Att - 171
Sp Def - 179
Speed - 118
Hydro Pump, Surf, Aurora Beam, Waterfall

Soap the Charizard Lv 78
Attack - 170
Defence - 155
Sp Att - 205
Sp Def - 153
Speed - 209
Blast Burn, Heat Wave, Dragon Claw, Fly

Sabin the Lucario Lv 82
Attack - 223
Defence - 141
Sp Att - 216
Sp Def - 134
Speed - 179
Ice Punch. Close Combat, Aura Sphere, Dragon Pulse

Cecil the Espeon Lv 88
Attack - 167
Defence - 147
Sp Att - 258
Sp Def - 221
Speed - 202
Morning Sun, Psychic, Future Sight, Bite

I've never really looked into proper EV training or any of that so I guess what I'm looking for here is more general advice and things I could do to get the most out of my team, aside from a leftovers most of the squad are holding items that boost same type attacks