Hippowdon is one of the best mixed walls in the game, checking some of the metagame's most prominent threats such as Aegislash, Mega-Pinsir, Talonflame, and Garchomp. It has everything a wall could want; good typing, great bulk, and reliable recovery. It also has good supporting options in Stealth Rock and Whirlwind, and is useful on sand teams due to its ability, Sand Stream. Its attacks also pack quite a punch for a defensive Pokemon. However, it is painfully slow and has common weaknesses to Water- and Ice-type moves. It also has to rely on Whirlwind to stop setup sweepers, making it somewhat easy to wear down Hippowdon.

Specially Defensive
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name: Mixed Wall
move 1: Earthquake
move 2: Stealth Rock
move 3: Slack Off
move 4: Toxic / Rock Slide / Whirlwind
ability: Sand Stream / Sand force
item: Leftovers
nature: Impish
evs: 252 HP / 116 Def / 140 SpD

Moves
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Earthquake is a strong STAB attack that deters frail sweepers from setting up on Hippowdon. Stealth Rock is a great support move and Hippowdon is very good at setting it up due to its great bulk. Slack Off provides reliable recovery making it more difficult to wear it down. The last slot depends on what your team needs. Toxic cripples opposing walls such as Mandibuzz and Rotom-W, making it easier for teammates to sweep. Rock Slide breaks Air Balloon and covers Talonflame, Mega Charizard Y, and Mega Pinsir. If your team can handle them, consider Whirlwind as it gets rid of your opponent's stat boosts while racking up entry hazard damage. It is Hippowdon's best chance against bulkier set-up sweepers like Mega Scizor.

Set Details
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This set allows Hippowdon to take 2 Shadow Balls from max Special Attack Aegislash after Stealth Rock. It can also function as a catch all check for attackers from both sides of the spectrum such as Talonflame, Garchomp, Terrakion, non CB Dragonite, un-boosted Mega Pinsir, Bisharp, Thundurus, and Gengar.  He can come in on Char Y to disrupt Solarbeam, but does not avoid the 2HKO from Fire Blast in or out of sun.  Leftovers is used to provide passive recovery which could mean the difference between an OHKO or 2HKO. Sand Stream is the preferred ability as it lets Hippowdown disrupt opposing weather, although Sand Force can be used if Sand Stream is detrimental to rest of your team. Smooth Rock with Sand Stream can be used to provide a sweeping opportunity for Sand Rush Excadrill or to give a boost to Mega Garchomp's Earthquake and Stone Edge, as it extends the number of sand turns to 8.

Usage Tips
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Try to keep Hippowdon as healthy as possible if there is a Pokemon on the opposing team that can be checked by Hippowdon, as its low Speed often forces it to take 2 hits before it can fire off an attack. Keep in mind that Hippowdon can set up Stealth Rock several times, so you don't have to worry too much about Defog or Rapid Spin. Thanks to its naturally high Defense stat, it can take weaker physical attacks easily. If you see a Pokemon that is badly affected by sandstorm on the opposing team, such as Chansey or Mega Venusaur, always try to take advantage of it.

Team Options
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Hippowdon appreciates teammates that can take on special attackers easily, such as Chansey and Latias, as he is primarialy a physical check.  The former can also rid Hippowdon of any status effect that it might have been inflicted with, while the latter can use Defog to support the team.
A way of controlling entry hazards on your side, such as Defog, is appreciated as Hippowdon can potentially be 2HKOed by taking entry hazard damage followed by two hits from the opponent. Latias and Mega Scizor are good candidates, having solid synergy with Hippowdon. Hippowdon also appreciates teammates that can switch into Water-, Ice-, and Grass-type attacks aimed at it, such as Ferrothorn and Mega Venusaur.  Hippowdon in return can check Talonflame and Mega Pinsir who threaten Mega Venusaur.  If you are using Mega Venusaur, be sure to use Sand Force as Hippowdon's ability as Sand Stream reduces Synthesis recovery.  Ferrothorn can also lay Spikes, which can quickly wear down the opponent in conjunction with Stealth Rock, sand, and Whirlwind. Rotom-W also makes a great defensive teammate, as it can take Water- and Ice-type attacks for Hippowdon.   Mega Garchomp and Sand Rush Excadrill also appreciate the sand provided by Hippowdon, becoming a fearsome sweeper or wallbreaker respectively.