Sorry Dragons. Not trying to suppress your answer or anything, but going descriptive.
Major defensive stat
Usable offense allows it to dish out hits really well
When in sand, this thing can be unstoppable
Access to Stealth Rocks means that almost guaranteed SR with those defenses
Heavy Slam is boss on this thing
Gyro Ball works well as well
Elemental Fangs are good and it gets access to them
Earthquake and Stone Edge will hit HARD
Special Defense is not the greatest out there and can be easily KO'd with a special super-effective hit
Movepool is not great
In Wonder Room (do people even use this?) this thing is so vulnerable
Taunt + Will-O-Wisp Sableye shuts it down
Extremely low speed might cost you the game
Good Pokemon, but only used to maximum potential under Trick Room and Sandstorm
A good set:
Steelix @ Steelixite
Ability: Sturdy ---> Sand Force
EVs: 252 Hp/56 Atk/200 Def
-Heavy Slam/Gyro Ball (depends on nature)
-Rock Slide/Stone Edge (singles or doubles)
Last slot is of your choice. Swear, explode or use your tail? xD
Extreme Defense stat like Steelix can be further boosted by Iron Defense and completely annoy the opponent
Slack Off pisses everyone off
Calm Mind can help boost that on par special defense stat
Icy Wind makes for a good doubles move
Gets Fire Blast. This seems a little bizarre doesn't it?
Can set up Trick Room by itself without any needed support
Might not get to live to Greninja or Bisharp in the new VGC
Gengar is quite common so this thing dies easily
(doesn't really count) Looks like dinner to me
Most people might see this as a threat in doubles and eliminate it first before it stes up
Also does not have the biggest movepool out there
Good Pokemon with and without Trick Room. Just watch out for special attackers though.
A good set:
Slowbro @ Slowbronite
Ability: Oblivious ---> Shell Armor
EVs: 200 Hp/56 Def/56 Sp.atk/200 Sp.def/
-Psyshock/Flamethrower/Fire Blast/Grass Knot
Hope I helped!
-It's a secret!