What the hell is that thing??
Slow hard hitter. Quite cool, but the looks are just weird.
Nasty plot sweeper:
Beheeyem @ Life Orb
Quiet nature (+Sp.Atk, -Speed)
EVs: 252 Sp.Atk, 252 HP, 4 Def
Trait: Analytic
-Nasty Plot
-Psychic / Psyshock
-Shadow Ball
-Thunderbolt / Energy Ball
It doesn't have a really wide special movepool. Shadow ball hits psychics, psychic is STAB, and the final move is filler since it doesn't get a fighting move to cover Darks or steels.
Choice Specs:
Beheeyem @ Choice Specs
Quiet nature (+Sp.Atk, -Speed)
EVs: 252 Sp.Atk, 252 HP, 4 Def
Trait: Analytic
-Psychic / Psyshock
-Shadow Ball
-Thunderbolt / Energy Ball
-Hidden power fighting
pretty self-explanatory I think.
Beyeehem that attacks first?
Beyeehem @ Life Orb
Quiet nature (+Sp.Atk, -Speed)
EVs: 252 Sp.Atk, 252 HP, 4 Def
Trait: Synchronize
-Trick Room
-Psychic / Psyshock
-Shadow Ball
-Thunderbolt / Energy Ball / Hidden power fighting
If you have a slow team that can take advantage of Trick Room it could be worthwhile.
Defensive
Beyeehem @ Leftovers
Calm nature (+Sp.Def, -Attack)
Trait: Synchronize
Not sure on EVs
-Recover
-Calm Mind
-Psychic / Psyshock
-Reflect
Calm Mind recover for defensive power on special side, while reflect covers physical side. Psychic to inflict damage and prevent you from becoming taunt bait. Taunt Tyranitar (or other darks with taunt) still walk all over this though.
Double screens
Beyeehem @ Light Clay
Calm nature (+Sp.Def, -Attack)
Trait: Synchronize
Not sure on EVs
-Reflect
-Light Screen
-Thunder Wave
-Psychic / Psyshock
Thunder Wave for additional support in taking down switch-ins.
Counters: Tyranitar fears Energy Ball and Hidden power, but is otherwise pretty safe and can use Crunch or Pursuit to destroy this crazy thing. Heatran resists everything it has apart from hidden power and is hit neutrally with Thunderbolt. Metagross is pretty much immune to Psychic attacks and can pursuit it down or hit it with Meteor Mash.
It is a bit more bulky than Alakazam or Gengar, and it gets Thunderbolt and Analytic that Alakazam doesn't get, but it lacks the important Focus Blast that pokémon like Gengar and Alakazam get to cover Steels and Darks, and while it is more bulky than those two, it isn't a mountain. If it uses Analytic, it has to take a hit every time it attacks and that slow speed is still hindering in a hard-hitting environment.
Master balls are the cheapest thing ever invented. It's more fun catching everything with balls that can fail. 'caught Latios in the wild without master ball ftw'