Makes great doubles support with the ability to set up Trick Room, Gravity, Reflect & Light Screen, spread paralysis with Thunder Wave, Ally Switch, Simple Beam, and with Telepathy to not get hit by things such as Earthquake from your partner Pokemon.
Dual Screens:
Beheeyem @ Light Clay
Ability: Telepathy
EVs: 252 HP / 252 Sp. Atk / 4 Def
Modest/Quiet Nature
IVs: 0/31 Spe
-Psychic/Psyshock
-Thunder Wave/Gravity/Trick Room/Safeguard/Ally Switch
-Reflect
-Light Screen
Dedicated Trick Room Setter:
Beheeyem @ Sitrus Berry
Ability: Telepathy
EVs: 252 HP / 252 Sp. Atk / 4 Def
Quiet Nature
IVs: 0 Spe
-Psychic/Psyshock
-Trick Room
-Simple Beam/Safeguard/Reflect/Gravity/Ally Switch
-Simple Beam/Safeguard/Reflect/Gravity/Ally Switch
Using Thunder Wave works particularly well with Landrous-T, because dual screens can support its average bulk and Thunder Wave works well with non-Choice Scarf variants, as its speed is 91. With Telepathy, it isn't hurt by Landorus-T's Earthquake or even Explosion if you choose.
With Gravity, it supports Politoed well because it doesn't get hurt by Surf and makes Blizzard and Hypnosis 100% accurate. Trick Room supports Beheeyem itself and any other slow Pokemon that may be its partner.
As a dedicated Trick Room setter, a notable partner is Slowbro because it is slow, gets double Calm Mind boosts from Simple Beam, and has access to a spread STAB move in Surf, which Beheeyem isn't hurt by because of Telepathy.