Create or modify a status effect!

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Status Name: Freezer-Burn
Status Acronym: FRB
Status Effect: Freezer-Burned Pokémon have speed and attack reduced by half. Each turn they have a chance to take burn damage (33%), be completely immobile (33%), or attack normally (33%).
Used by Types: Animal-based Ice types.
Resisted by Types: Fire, Ice.

Status Name: Vulnerable
Status Acronym: VLN
Status Effect: Has no effect on its own, but leads to status-inflicting moves used by the opponent having a 100% chance of applying their associated status.
Used by Types: Psychic, meditation-based Fighting types (Medicham, etc).
Resisted by Types: Psychic, Dark

Status Name: Petrified
Status Acronym: PTR
Status Effect: Makes the affected pokemom immobile for 1-5 turns.
1st Turn - 0% Chance, 2nd Turn 15% Chance, 3rd Turn 40% Chance,
4th Turn 75% Chance, 5th Turn 100% to be freed of the effect.
Will only occur when used by a female Pokemon against a male Pokemon
otherwise the Moves with secondary effect Petrified will still work without the
Secondary effect.
Used by Types: Not necessarily types but rather pokemon who you would say would be similar to medusa like mawile could count or female snakes
Resisted by: Female Pokemon can counter this
Example for a Move: Petrify - 80 BP - 90% Accuracy - Rock Type - Special - 40% Chance to Petrify the opponent

Status Name: Contagious or Illness
Status Acronym: CNT or ILL
Status Effect: Affected Pokemon will lose 1/8 of their HP every turn and Pokemon making contact with the affected Pokemon have a 70% chance to be inflicted by the status too
User Types: Could be Grass or Bug Pokemon
Resisted Types: Could be Grass or Bug Pokemon

Because I'm a gloomy person...
Status Name: Heartbroken
Status Acronym: HTB
Status Effect: Lowers the the affected Pokemon's Special Defense. Causes the affected Pokemon to lose some of their HP each turn as long as the Pokemon who inflicted the status is in battle.
Used by Types: Any?...But maybe it could be more associated with Normal and Fairy Types, like Infatuation is?
Resisted by Types: Dark Types
Or
Status Name: Traumatized
Status Acronym: TRM
Status Effect: Affected Pokemon have lowered Special Defense and a chance of being immobilized each turn.
Used by Types: Psychic, Dark and Ghost
Resisted by Types: None
Certain Pokemon - Xatu, for example - could have an Ability which powers up their Psychic attacks when Traumatized, or even inflicts the status like a Toxic/Flame Orb. The currently useless move Hold Hands could heal both of these statuses.

Status Name: Slow
Status Acronym: SLW
Status Effect: The flow of time around the Pokémon slows down. In practice, it means the priority of all of its moves is reduced by 2, and moves such as Tailwind or Trick Room don't fix the situation. The Pokémon also can't land critical hits. The condition disappears on its own after 2 to 5 turns. Visually, the Pokémon appears to move slower and after-images appear when it does.
Used by Types: Psychic, Ghost
Resisted by Types: Psychic, Ghost

Status Name: Stasis
Status Acronym: STS
Status Effect: The flow of time around the Pokémon completely stops. In practice, it renders the Pokémon completely invincible, but also impossible to use items on and switch out. The Pokémon also can't move at all, all moves used on it will fail, and multi-target moves won't affect it. Basically, the Pokémon might as well not be there at all. Stasis lasts up until 3 turns, but the probability of recovering is relatively high each turn. This ability can be used to temporarily take out one of the opponents in a Double/Triple/Rotation Battle, but its use isn't reliable enough to work as a consistent strategy. Visually, the Pokémon freezes and becomes monochrome for the duration of the status.
Used by Types: Psychic, Ghost
Resisted by Types: None

The following two are basically variations of the burn status, but with different types:

Status Name: Infested
Status Acronym: INF
Status Effect: What appears to be a swarm of minuscule bugs continuously surrounds the Pokémon, breaking its concentration and therefore lowering its accuracy, while also sapping its HP after every move. The Pokémon can be freed of the condition by getting hit by a wind-based move such as Gust, Twister etc or heal itself by using Defog or Rapid Spin (100% probability) or any move that involves it running or flying quickly (such as Rapid Spin, Quick Attack, Fly, Brave Bird) (20% probability) .
Used by Types: Bug
Resisted by Types: Fire, Bug

Status Name: Overgrown
Status Acronym: OVG
Status Effect: The Pokémon is overgrown with parasitic vines that sap its life force. In gameplay, it means: lower Special Attack and HP drained after every turn. The Pokémon can be freed of the condition by getting hit by a Flying-type move (50% probability), a Fire type move (20% probability) or specifically Cut or Fury Cutter (100% probability, and the move deals no damage), or heal itself by using Rapid Spin or Flame Wheel.
Used by Types: Grass
Resisted by Types: Grass, Bug, Poison, Steel

The title says modify too. I would nerf the Frozen Status. I don't know if it is only me but if I get frozen I am for sure not thawing out till my Pokemon is dead. There should be a raise of probality of thawing out with every turn.

Status Name: Enraged
Status Acronym: ENR
Status Effect: Pokémon both does and takes 1.5x damage. Accuracy is halved. Critical hit chance is 0%.
Used by Types: Psychic types.
Resisted by Types: Psychic types.

Status Name: Fatigued
Status Acronym: FTG
Status Effect: affected pokemon skip a turn in battle, like Slaking's Truant or a hyper beam recharge
Used by: Pokemon I like, serious answer: normal types
Resisted by: Pokemon I like, serious: ghost since ghost can't get tired

Status Name: Drowning
Status Acronym: DRW
Status Effect: The Pokemon get's into a state of panic because of the drowning losing 1/16th HP for 2-5 turns, it is confused and his attack and special attack stats are doubled while it's speed is halved (only for the duration of the status).
Status inducing moves: For example Surf could have a 10% chance of inflicting it or other Water Type Moves.
Used by: Mainly Water Types
Resisted by: Water Types

Status Name: Terrain Burst
Status Acronym: TRB
Status Effect: This causes all affected Pokemon to take damage from terrain, every turn(based on their type effectiveness, like stealth rock). The status will stop dealing damage if the terrain expires(but will persist), and will resume if a new terrain is created.
Used by Types: Grass, Fairy, Psychic, Electric
Resisted by Types: Steel (durable), Dragon (hardy, and can thrive in many conditions)