Urgh, weren't you paying attention to what Mullet told you? ~_~ You would do well to heed his advice on your Charizard too, because the current set is...nyah, let's not get into that. xP For walling, a couple of good pokémon could be:
Claydol @ Leftovers
Nature: Relaxed
Moveset:
Earthquake
Ice Beam
Reflect/Light Screen
Rest
Earthquake for STAB, Ice Beam to handle the stuff that Earthquake can't touch. The choice between Reflect and Light Screen depends on whether physical or special attacks give you more trouble (Looking at your team, I'd say the better choice would be Reflect) and Rest is there for obvious reasons. Competitive builds usually have Rapid Spin and/or Explosion, but since I assume this is for ingame use I won't bother with that.
Skarmory @ Leftovers
Nature: Impish
Moveset:
Drill Peck/Aerial Ace
Rest
Spikes/Toxic
Roar/Whirlwind/Substitute
Very standard Skarmory, although it really isn't much good outside trainer battles. Spikes and Whirwlind/Roar are what should be used in competitive battles, but it's kind of pointless ingame so for something a bit more ingame friendly, you could try Toxic and Substitute over Spikes and Whirlwind/Roar. At any rate, Rest is a must and you can't get both Whirlwind and Drill Peck on the same set (They come from different breeders). But really, I'd just skip this one if I were you.
Steelix @ Leftovers
Moveset:
Earthquake
Rock Slide
Iron Tail/Toxic/Sleep Talk
Rest
A very formidable physical wall. Earthquake enjoys STAB and allows for some serious damage while Rock Slide covers almost everything that Earthquake doesn't. Rest is a must if you want to wall with it, and for the final move, You could get some extra STAB damage from Iron Tail while Toxic would let you whittle down your opponents HP faster and Sleep Talk would allow attacking even during Rest. Roar is common competitively, but it's not very useful ingame so I'm not suggesting it.
Special walls:
Blissey @ Leftovers
Nature: Calm/Bold
Trait: Natural Cure
Moveset:
Seismic Toss/Ice Beam
Ice Beam/Thunder Wave/Counter
Aromatherapy/Heal Bell
Softboiled
Very formidable wall due to its insane HP. Seismic Toss and Ice Beam are probably your best bets for causing damage since Blissey isn't exactly the strongest poke out there. Aromatherapy or Heal Bell are useful because they rid the whole team of status problems, allowing some shameless Rest abuse and not taking Softboiled with Blissey's insane HP stat would be a sin.
Snorlax @ Leftovers
Trait: Thick Fat
Nature: Impish
Trait: Thick Fat
Moveset:
Double Edge/Return
Earthquake/Shadow Ball
Rest
Sleep Talk/Curse
Yeah, if you take Curse then you can go for Return to avoid the recoil damage, but otherwise, take Double Edge for the added power. For the second damaging move, take Shadow Ball only if your ghost paranoid, otherwise, Earthquake is far better.
Regice @ Leftovers
Nature: Calm
Moveset:
Ice Beam
Thunderbolt
Thunder Wave/Toxic
Rest
One of the best (If not the best) special walls out there. It's got a terrible weakness to physical attacks, though, so you might want to watch out for that. Thunderbolt and Ice Beam let you deal good damage to the most, and Thunder Wave is great for crippling stuff - Not quite as useful as in competitive play, but still worthwhile - although if you want some extra damaging potential you could try Toxic as well. I wouldn't use this one, though, since you've already got a pretty nasty rock weak on this team and might not want to amplify it.
So...any of that help? =P