Tentacruel, The Jellyfish Pokémon. It has large red orbs on its head. The orbs glow before lashing the vicinity with a harsh ultrasonic blast. It's outburst creates rough waves around it. It has tentacles that can be freely elongated and shortened at will. It ensnares prey with its tentacles and weakens the prey by dosing it with a harsh toxin. It can catch up to 80 prey at the same time. It lives in complex rock formations on the ocean floor and traps prey using its 80 tentacles. Its red orbs glow when it grows excited or agitated. It's tentacles can sting, causing poisoning and sharp, stabbing pain. The tentacles are normally kept short. On hunts, they are extended to ensnare and immobilize prey.
A Good Moveset for Tentacruel would have to be this:
Both Clear Body and Liquid Ooze are useful in their own situations but Clear Body takes priority for being able to block Intimidate from switch ins among other things.
Strategy Using Tentacruel
With Tentacruel's great speed stat, access to a STAB physical move and a special STAB move to handle the resisters Tentacruel is a top UU sweeper. Given a late-game start when it's counters are weakened or beaten Tentacruel can easily sweep after a single Sword Dance. Sludge Bomb handles most Pokémon and the handful of it's resistances can be handled with Hydro Pump. The choice between Substitute and Ice beam is dependant on personal preference. Substitute usually takes priority over Ice Beam but there are situations where Ice Beam is useful, particularly for being able to OHKO Salamence. Giga Drain is also handy in certain situations, namely for being able to handle Quagsire and Swampert (and Whiscash) which cause problems for this set by blocking Sludge Bomb but not being OHKOed by Hydro Pump.
EVs: 252 Atk / 148 Spd / 110 SDef
Enough speed to outrun Base 100 Pokémon without +Speed natures is all it really needs, although 318 Speed may be considered optimal for outrunning the likes of Jynx or 310 for Modest Manectrics. Aside from that Attack and Special Defence are all you need to focus on.
Other Optional Sets
Tentacruel @ Leftovers / Petaya Berry
Special Sweeper Tentacruel. Rather versatile but lacks the sheer force and game-ending power of the physical sweeper. It's useful however for it's surprise factor. Sludge Bomb is useful for Special Walls, Hidden Power [Electric] for Mantine and Gyarados (who can wall this set easily) and Substitute for it's general versatility and ability to activate a Petaya Berry.
Tentacruel @ Leftovers
Special-Wall-Cruel. In between Surf, Sludge Bomb and Ice Beam it has enough versatility to do some damage. With Mirror Coat (and some Wish support) it can cause major problems for special attackers, with Haze (and some adjustments with EVs to speed) it can be a quick Hazer and with Rapid Spin it can spin away Spikes, although this is the least useful since there are other spinners available.
Other Optional Moves
Safeguard, Barrier, Toxic, Screech, Confuse Ray. Safeguard can block statuses for the whole team and could be worked onto the Special Wall. Barrier helps it's weaker defence but Tentacruel has better things to do and stalling with defence stat-ups is broken by crits. Toxic hurt Pokémon trying to wall it and is a lot more viable in UU with the lack of viable clerics and combined with Liquid Ooze can be deadly. Screech works alongside Sludge Bomb and Spikes. Confuse Ray can stall. Most of these would be best worked onto a Utility/Wall Tentacruel since none of these help the sweeper sets.
Strategy Against Tentacruel
Ground types, Volt-Absorb (especially on Chinchou), special walls, Substitutes prior to Thunder Wave.
A good Contest Moveset for Tentacruel would have to be this for the Beauty Contest best with Modest, Mild, Rash or Quiet Nature:
Strategy Using Tentacruel
If you do the attacks in this following order you should have very few problems; 1st - Hail, 2nd - Blizzard, 3rd - Hail, 4th - Ice beam/Blizzard, 5th - Hyper beam
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