Here in Crater we have unique pokemon! We call them "Type Changes" While many other regions have What we call "Canon" pokemon or what is known as the Ancestors In Crater. it's VERY rare to find a Ancestor pokemon.
Everything on the island has been effected by the ores found all over.
Here's a Ancestor Wurmple and here are examples of a Wurmple found as any type on the Islands of Crater.
Ancestor wurmples are native as being a BUG type. But here on Crater being a bug type means a bit more, your pokemon needs to also physically LOOK it's type. Here's a list of helpful design choices for the different Type Changes.
Bug type : extra limbs, segmented body, antennae, insect wings, compound eyes, mandibles.
Dark type : darker/black colour, horns, spikes, devil's tail, sharp/evil look, nightsky (must be more than just white dots on a solid background).
Dragon type : scales, horns, dragon wings, claws, tail, spikes/fur along spine.
Grass type : green colour, plants, leaves, vines, flowers, bushes, moss, roots, bark, seeds.
Ground type : brown and grey colours, sand, muddy look, drills, digging claws (careful not to confuse with rock type).
Ice type : white/light blue colour, icicles, snowflakes, thicker fur, arctic species, blubber.
Electric type : yellow colour, lightning markings, plasma, storm clouds, static.
Fairy type : pastel colours, hearts, sparkles, fluffy softness, fae folklore/fairy tales, fantasy. crowns, flowers, lace
Fighting type : MUSCLES, martial art accessories, bandages, bipedal, superhero look. Beat up.
Normal type : light browns and normal nature muted colours, fur, quadrupedal, real world species.
Poison type : purple colour or bright warning colours, venomous and poisonous animals, biohazards, radioactive, spikes, stingers, goop, gas.
Psychic type : purple colour, eye motifs, spiritual/religious references, runes, magic, SPAAAAAAAAAAACE.
Fire type : red or other fire colours, blues and whites, fire, flame patterns, lava, ash, explosions.
Flying type : light blue colour, white clouds, wings, avian features, feathers, beaks. Flying mechanics such as Steampunk aviation, D'vinci
Ghost type : paler colours/white, ghosts, spirits, disembodied parts, skeletons, zombie, death motifs (can vary between cultures such as Dia de Muertos).
Rock type : brown and tan colours, crystals, stalagmites/stalactites, petrification, rocky armor.
Steel type : gold/silver parts, metal armor, blades, robotic, steampunk with cogs/gears, wires.
Water type : blue colour, webbed feet, fins, gills, fish tail, bubbles, coral.
Nova and Void are 2 of Crater's EXCLUSIVE type changes and you can find out about them