Diglett

Despite poor defensive stats and mediocre offensive stats, Diglett is one of the defining Pokemon of the Little Cup metagame thanks to its ability Arena Trap, which allows it to revenge kill grounded Pokemon without giving them the option to switch out. Diglett is helped in its revenge killing by a high Speed stat, which allows it to tie for the fastest unboosted Pokemon in the metagame, and a useful offensive typing that gives it super effective STAB coverage on a wide variety of Pokemon. Its moveset is also somewhat customizable, with its movepool including options such as Sucker Punch and Sludge Bomb, allowing it to, for the most part, trap and take on whatever Pokemon its team needs removed. A wide variety of support moves are also at its disposal, allowing Diglett to support its team after trapping the Pokemon it aims to eliminate.

However, Diglett's poor defensive stats leave it unable to safely switch into the Pokemon it aims to trap and susceptible to opposing priority. It is forced to choose between a Focus Sash set, which lacks power, or a Life Orb set, which has no chance of switching into battle. Even with a Life Orb, Diglett is still quite weak, as it only reaches 15 Attack. Diglett is also easily revenge killed or set up on after trapping and KOing an opposing Pokemon thanks to its mediocre stats.