Invasive
Invasive is a type that focus on parasitic or invasive species. They'd be speacies who unnaturaly joined an envyroment and cause harm. Fast reproduction and aggresive expanding also may allow a mon to become Invasive.
Possible Invasive-Typed Pokémon:
...no explaination needed
and
Based off of real invasive species. Rattata are non-native and widespread, while Gumshoos was brought to hunt them down, but ended up being an invasive species itself since it hunts at day while Rattata go out at night.
Most Dex Entries mention them as coming from overseas, breeding quickly and causing harm to the envyroment. All of these fit under the Invasive category.
Based on Feral Cats on Hawaii, who have become invasive. They were brought to the royals in past times, but once the royalty was no longer around, they gone back to nature. They are also widely spread across Alola.
This fish is everywhere, breeds fast and cannot be eaten. Magikarp is adapted to live in any kind of body of water (Acording to dex entries). If we count how many fish-based pokémon there are in each region, it composes 50% in Kanto, 43% in Hoenn (Closest to this is at
15%) and 46% of Sinnoh, as well as 30% of Alola. Irl, invasive carps can cause harms to an ecosystem, decreasing the ammount of vegetation and increases ammonium concentrates.
Doves were brought to the American states (Which is where Unova would be located) by mankind and due to lack of predators, just spread everywhere. They also carry tons of diseases
The Mushroom is a parasite. Not much to explain
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All UBs are invasive species
*In case any of Blood / Food wins, replace secondary type (Buzzwole / Guzzlord) by these
Invasive to Alola + literally invades Nebby's body
Possible Type Effectiveness:
Strong Vs.
Heart
Viruses fuck up your health
Normal
I'd see Normal as creatures who are used to the envyroment. They'd be affected by an invasive species
Ground, Water
Invasive species mess up envyroment. This is the closest we have to that.
Space
Space is easy to invade now that I think about it.
NvE Vs.
Dragon
Try to invade a Dragon's lair. You'll get yo ass beaten
Psychic
One cannot invade a well-trained mind
Fire
Don't invade a burning thing.
Weak To
Psychic
The best way to kill off an invasive species is to capture and eliminate that species from that area, or relocate the species. So, strategy kind of makes sense
Ghost
Cause they are spirits who could not possibly suffer from envyromental changes created by the invasive species
Poison
Pesticides and stuff (as suggested)
Resists
Water, Ground
All can be taken as envyroments, which invasive species adapt to easly
Normal, Bug
Regular creatures are usually harmed by the invasive ones
I'll think of retyped moves later. Open to suggestions about anything
