Toxtricity is a bipedal, lizard-like Pokémon with two forms. Both Amped Form and Low Key Form Toxtricity have purple-colored bodies and white eyes with black irises. Both forms also have four spikes on the back, four spikes on each wrist, and a crescent-shaped body part with seven spikes on the waist.
Amped Form Toxtricity has a slouched posture. It has a yellow underbelly, yellow stripes on its legs, and yellow accents on its back, palms, and soles. It also has a yellow electric frill that extends from its snout to its neck. Two additional electric spikes protrude from its back. It has four horns: two smaller ones above its eyes, and two larger ones on the sides of its head. Six organs protrude from its chest. Amped Form Toxtricity are known to be short-tempered and extremely confident. This form aggressively attacks anything that makes eye contact with it.
Low Key Form Toxtricity has an upright posture, with its neck standing tall. It has a light blue underbelly, light blue stripes on its legs, and light blue accents on its back, palms, and soles. It has a large fin-like horn in front of its face, and two smaller horns on the sides of its head. Its two light blue electric frills run from the base of its larger horn, and down to its neck. Four organs protrude from its chest. Low Key Form Toxtricity are known to be selfish and dismissive of others and have high regard towards their strength. Unlike its Amped Form counterpart, Low Key Form Toxtricity prefers to taunt opponents into fighting it when making eye contact with them.
By clawing at the organs on their chests, both forms of Toxtricity can generate over 15,000 volts of electricity, as well as sound. The sounds they make resemble those of electric string instruments: a standard guitar for Amped Form, and a bass guitar for Low Key Form. Toxtricity chugs stagnant water to absorb the dissolved toxins, which it then breaks down in order to generate electricity. Toxtricity is the only known Pokémon capable of learning the move Overdrive, as well as the only known Pokémon that can have Punk Rock as an Ability.
Toxtricity has three forms: Amped Form, Low Key Form, and Gigantamax Toxtricity.
Gigantamax Toxtricity attacking with its guitar-shaped electric mass
Toxtricity's two forms share the same Gigantamax form. As Gigantamax Toxtricity, it has a larger appearance that resembles a combination of its two forms. It walks on all fours, but it is also capable of standing on its hind legs. It has a dark purple body with a dark pink underbelly and dark pink accents on its back, soles, and hind legs. Its spikes and the crescent-shaped body part on its waist turn bright pink, and from its waist grows a tail resembling a transmission tower, and two protrusions that resemble conductor coils. Three red clouds surround its tail. It has four horns on its head, and three large electric frills that run from between its horns down to its back: a yellow one at the center, and two light blue ones flanking it on either side. Its eyes have light blue sclerae and yellow pupils, which extend outside of its sclerae, resembling stars. Its chest has two light blue and four yellow organs protruding.
Gigantamax Toxtricity's main weapon is its excessive electric energy, which contains more electricity than a thundercloud. It can store up to one million liters of poison. This poison penetrates Gigantamax Toxtricity's brain and causes it to go berserk, leaking toxic sweat all over its body like acid rain. To attack, Gigantamax Toxtricity uses its stored electricity to create a guitar-shaped mass and slams it down toward opponents. The energy and momentum of this attack are powerful enough to create a giant crater. Gigantamax Toxtricity is the only known Pokémon capable of using the G-Max MoveG-Max Stun Shock.
Toxtricity is the only Pokémon with a base stat total of 502.
All of the Natures that lower the Attack stat (Bold, Timid, Modest, Calm) only belong to Low-Key Form Toxtricity; likewise, all of the Natures that lower the Special Defense stat (Naughty, Lax, Naive, Rash) only belong to Amped Form Toxtricity.
Toxtricity, its pre-evolution, and its Gigantamax form were all designed by Yusuke Kozaki.
Alternatively, Toxtricity may be based on newts, which are a type of salamander. Newts are poisonous, have rounded toes, and lizard-like bodies. The Northern crested newt in particular resembles Toxtricity, sharing its jagged crest, yellow underbelly, and spots resembling the chest protrusions. The spikes on the side of the Pokémon's head are reminiscent of the gills newts have in their larval stage.
Toxtricity also appears to be based on punk rockguitarists. Its Amped and Low Key forms resemble electric guitars and bass guitars; the number of their chest organs equals the number of strings on each guitar (six and four, respectively), and they make sounds similar to those of the respective instruments when strummed. Its appearance features several fashion elements commonly associated with punk, such as the mohawk hairstyle, torn pants, and spiked bracelets and belts. Gigantamax Toxtricity's ability of generating a guitar-shaped spark to attack may be a reference to guitar smashing, a common act by guitarists at the end of a concert set where they smash their guitar against the floor.
Toxtricity may be a combination of toxic or toxicity and electricity.
Strinder may be a combination of strings (of a stringed instrument) and salamander.