Reserving Cresselia and Gligar
Cresselia
Typing:
Base Stats: 130 / 80 / 130 / 85 / 140 / 95
Ability: Levitate
What it Does: Cresselia can do a variety of things do to incredible bulk. Its mixed bulk is the best in Tier Shift, sporting unbelievable 130 / 130 / 140 bulk. This makes it a great wall, able to deal with such threats as Choice Band Sawk, Keldeo, Mega Alakazam, and most of the rest of the metagame. Thunder Wave can help cripple threats such as Durant that attempt to counter Cresselia, and leave them easy for teamates to take down. Levitate is also a great ability that gives it a Ground immunity but no weakness to Ice, Electric, or Rock moves. It isn't simply reserved for a wall though. It is also the best Calm Mind sweeper in the metagame as it gets STAB on Physhock and can easily take physical attacks. While it may have no coverage for Steel-types, it can hit everything else with Ice Beam, Moonblast, and Grass Knot for coverage. In addition to coverage, it has unique access to Lunar Dance. This signature move can completely heal a weakened teamate and can them a second chance with sweeping. Other options include a Trick set with Choice Scarf and a bulky Dual Screens lead.
Why this Rank: With all this versatility and bulk, it would heartily deserve S-Rank if it didn't have a few crippling flaws. The first is its typing. While Phychic typing does give it the ability to beat most Fighting-types, it is still a terrible typing. Weaknesses to Pursuit, Knock Off, and U-Turn don't it any favors. Speaking of U-Turn, Mega Scizor with Roost walls Cresselia unless it chooses to run the rare HP Fire. If it doesn't carry that, it is just fodder for Mega Scizor to set up Sword Dances all day long. The other problem is Moonlight. It only has 8 PP, and only restores 33% HP when facing a rain team. This allows it to be easily outstalled by many pokemon that force it to recover health too much. Even with all the flaws, it is still a great pokemon who can put in a lot of work.
Name: Gligar
Typing: Flying / Ground
Base Stats: 75 / 85 / 115 / 45 / 85 / 95
Ability: Hyper Cutter / Sand Veil / Immunity (HA)
What it Does: Gligar is a great wall and pivot in Tier Shift. While it does face competition from Gliscor, it sets itself apart by being bulkier with Eviolite (almost equal bulk without) and access to Defog (Gliscor gets it, but it is incompatible with Poison Heal). Gligar makes a good wall, able to take on threats such as Durant, Defensive Heatran, Jirachi without Trick, Mega Aggron, Diggersby, and many others. It also has access to both Defog and Stealth Rocks, giving it hazard control to support the team. U-Turn is also a great move that lets it get switch iniative and momentum, which is great on stall. U-Turn also gives it a place on Volt Turn teams that need a hazard remover. Immunity is a great ability when not using Defog, making the efforts of opponents trying to Toxic stall laughable. It has other options such as Baton Passing Swords Dances and removing items with Knock Off. While it can give iniative and hazard control, it still has a huge weakness to Ice and is crippled by Knock Off.
Why this Rank: Gligar is a very physically bulky pokemon, but in that department Alomomola takes the cake. Alomomola has better typing, access to Scald and Wish, and Regenerator. Gligar also faces competition from Avalugg. Avalugg can also remove hazards, and is more physically bulky and less crippled by Knock Off. Gligar is still B+ though because it has advantages over both and can pivot. Avalugg is a less reliable hazard remover who and is slow as anything. Alomomola doesn't have one turn recovery, and wishes (get it) it did. Knock Off is also a great tool for a wall and comes off a decent univested attack. It still does face a crippling Ice weakness and a hatred of Knock Off, but it can do its job.