Trapinch
Hyper Cutter
Prevents the enemy from lowering this Pokémon's Attack.
Arena Trap
Prevents switching and increases encounter rate.
Type Tier
Ground UU
Statistics
Min- Min Max Max+
HP
45
 - 231 294 -
Atk
100
 212 236 299 328
Def
45
 113 126 189 207
SpA
45
 113 126 189 207
SpD
45
 113 126 189 207
Spe
10
 50 56 119 130
Name Item Ability Nature

Trick Room Revenge Trapper

 Choice Band / Focus Sash Arena Trap Brave
Moveset IVs
~ Earthquake
~ Rock Slide
~ Quick Attack
~ Crunch
0 Spe
EVs
52 HP / 252 Atk / 204 SpD

This set is designed to be used on a Trick Room team as it is probably Trapinch's best chance at pulling off some revenge kills. With a Brave nature and a 0 Speed IV, Trapinch comes away with 22 Speed. While Trapinch lacks the defenses of its big brother Flygon and doesn’t quite have the Speed of its fellow Arena Trap cousin Dugtrio, it can still pack quite a punch off its base 100 Attack.

Here Earthquake is your main attack and your best bet at hitting something hard. Rock Slide is for type coverage against fliers and levitators should you ever need to kill one, but since they can switch out of Arena Trap you probably won’t be using it much. Quick Attack is useful for finishing off Focus Sash users, or anything else at low health, especially Pokémon trying to sweep with a Salac Berry if Trick Room isn't in play. Crunch is mainly a filler, though it will easily OHKO things like Alakazam should you be stuck in against one, does some damage to Celebi, and hits Claydol super effectively. It covers Solrock and Lunatone in UU.

This Trapinch is best used in combination with something like Trick Room Slowking. Bring out Slowking on something like Gyarados, and hope for a switch to an Electric type, as Slowking often carries Hidden Power Electric. If your opponent brings in something like Jolteon or Raikou, you’re in luck. After Trick Rooming on the aforementioned switch, bring out Trapinch to take the impending Thunderbolt. You’re then able to OHKO either of these with Earthquake.

EVs

328 Attack (252 EVs, + nature) always on Trapinch. The EVs provided allow you to survive a Hidden Power Ice / Grass from Modest Raikou, meaning only Magnezone and Zapdos can OHKO Trapinch with Hidden Power, they need to be Modest to do so, and it isn't guaranteed. Alternately, 272 HP (164 EVs) and 149 SpD (92 EVs) will allow you to survive Modest Manectric Hidden Power, likely the most powerful Special Attacker in UU. If you don't care about surviving a particular hit, 176 HP EVs and 40 EVs in Defense and in Special Defense will maximize your overall defensive abilities, but Trapinch really needs to specialize to survive stuff.

Opinion

Trapinch is mostly outclassed in OU by Dugtrio, who has significantly more Speed and slightly better defenses at the cost of a bit of Attack. Where Trapinch has Quick Attack, Dugtrio has Sucker Punch. That said, Trapinch can still make a decent trapper with Trick Room support (Trapinch is the second slowest competitive Pokémon, after Shuckle), especially in UU, where Dugtrio is not allowed.

In UU, Trapinch can take on things such as Manectric, Mawile and Camerupt (with Trick Room support if you get it in) to name a few, being able to OHKO each with its STAB move. Trapinch can also come in on things like Swalot and Ariados if you can predict a Poison attack.

Counters

Bringing in a "counter" on Trapinch usually isn’t possible due to Arena Trap. U-Turn and Baton Pass will help to get out of there, though they’re obviously situational. Logical Trapinch switch-ins once it is out are anything that can hit it decently hard, as it is very frail. Dugtrio makes a good option as well.