In Pokemon Scarlet and Violet, the following explains how to capture Wiglett and evolve it into Wugtrio.
One of the best things about getting a new generation of Pokemon is finding all of the Pokemon that live in that region. With 107 Pokemon introduced in Generation 9, Pokemon Scarlet & Violet does not disappoint, and some of them have very familiar designs. Wiglett, for instance, is an entirely different Pokemon that resembles Diglett.
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The fact that Wiglett is not a regional variant of Diglett caused controversy when it was announced prior to the game’s release, but the Water-type Pokémon has since made a name for itself. It has a long, white body resembling a snake, but it keeps only its head above ground, hence the similarity to Pokémon of the Ground type. Wiglett is a somewhat elusive Pokémon in the wild, so trainers will need to keep a keen eye out for one. Once they accomplish this, they can evolve it into its next form, Wugtrio. Here are the locations and evolution methods for Wiglett in Pokemon Scarlet & Violet.
Where To Find Wiglett

Wiglett, as a Water-type, prefers to spend his time in Paldea near the sea. As beaches are Wiglett’s preferred camping grounds, exploring the coastlines is a surefire way to locate them, but if spotted, they will burrow themselves completely beneath the sand. Trainers cannot interact with Wiglett when it is underground. It can be most effectively engaged in combat by sneaking up on it and catching it off guard. Water-type Pokémon are weak against grass- and electric-type Pokémon, so either can quickly reduce its HP. Be careful not to knock it out before you can throw a Pokeball. The move False Swipe is ideal for this, as it leaves the target with 1 HP when it would normally cause them to faint.
Wiglett is found in the subsequent regions:
East Country (Area Two)
South Country (Area One)
South Country (Area Six)
Port Marinada
At what level does Wiglett become Wugtrio?

Wiglett evolves into Wugtrio at level 26. As they gain experience points (EXP) and levels, Pokemon evolve. The most effective way to achieve this is to pit Pokemon against trainers or wild Pokemon. If the level of the opponent is higher, Pokemon will gain even more experience. In Gen 9, EXP sharing is an automatic feature, so Wiglett can sit comfortably in the party and gain strength. Wugtrio evolves into three eel-like creatures that emerge from a rock; unlike Wiglett, it is a bright red color.
Trainers can also use items to level up instead of engaging in Pokemon battles; for instance, Exp. Candy and Rare Candy are rare consumables that increase EXP when consumed. While exploring Paldea, players will notice tiny sparkles and glowing red Pokeballs, which are actually items or berries that have been dropped. They may become Rare candies. Tera Raid battles yield Experience Candies, similar to Max Raids in Pokemon Sword and Shield. They are available in XS, S, M, and L sizes, which affects the amount of EXP they grant.
Additional Details on Wugtrio

When compared to its original form, Wugtrio is a surprisingly aggressive attacker. Its Speed stat (120) indicates that it typically attacks first and strikes hard with its Attack stat (100). However, players should be wary, as its HP and Defense stats are low, resulting in poor damage resistance. Wugtrio is the only Pokémon known to possess the ability to use Triple Dive. This move’s signature splashes water three times at the target at just the right time to do damage.
Wugtrio can learn a large number of Ground-type moves even if it has no connection to Dugtrio. Mud-Slap and Sand Attack both make it harder for their targets to dodge, and Stomping Tantrum can do double damage if the conditions are right. Wugtrio is a great offensive Pokémon that can be used on any Pokémon team, even though it has weak defenses.