I keep hearing about sweepers and walls and stuff, and I understand what they are, but i'm not sure if there are more types of these. Explain please?

My Team is...

Heracross

HP 326
ATK 317
Def 161
Sp.Atk 97
Sp.Def 210
Spd 199

Reversal
Megahorn
Takedown
Close Combat

Mismagius

HP 285
Atk 169
Def 156
Sp.Atk 245
Sp.Def 259
Spd 226

Shadow Ball
Psywave
Thunderbolt
Dark Pulse

Tyrannitar

HP 362
Atk 316
Def 271
Sp.Atk 214
Sp.Def 266
Spd 162

Earthquake
Thrash
Crunch
Stone Edge

Magmortar

HP 276
Atk 204
Def 150
Sp.Atk 303
Sp.Def 186
Spd 206

Fire Blast
Confuse Ray
Lava Plume
Flamethrower
(thinking of switching up moveset cuz they're all practically the same move.)

Dusknoir

HP 243
Atk 234
Def 327
Sp.Atk 181
Sp.Def 324
Spd 135

Fire Punch
Shadow Punch
Confuse Ray
Payback

Lugia

HP 341
Atk 241
Def 352
Sp.Atk 207
Sp.Def 351
Spd 277

Thunder
Aeroblast
Earthquake
Psycho Boost

As far as I know I have two special sweepers (Mismagius, Magmortar)
Two Physical Sweepers (Heracross, Tyrannitar)
Two Walls (Lugia, Dusknoir)
Is that good?
Should I change up some pokemon because of their type?

viewtopic.php?f=27&t=22906

^ This thread gives a good explanation of the basic terms.

As for as the pokemon themselves go, Hera and TTar(W/dragon dance) are good physical sweepers. Magmotar lacks the speed to sweep and mismagius lacks the power and versatility for sweeping, Magmortar needs a scarf/speed boost to make him a good sweeper, otherwise he's just a good attacker. Mismagius is best suited for status-inducing and mild attacks. Dusknoir is a great wall and Lugia is one of the best, but lugia is banned from most battling venues.

Stat-wise your team is pretty bad, It'll do fine if you play others at the same level, but those breeding for natures, good EVs, IVs and egg moves will outclass you. For instance Magmotar's S.atk can hit up to 383 with a plus nature and 252 EVs.

Moveset-wise look >>here<< for good examples and combinations to start from.