Status ailments are different conditions that can affect the Ponymon's ability to fight. They can be divided into volatile and non-volatile ailments. Volatile ailments disappear when the battle ends or the Ponymon is switched; non-volatile ailments persist after battle and require some medicine or going to a Ponymon Center in order to heal the status.
Non-volatile[]
there is a 25% chance of this happening
Paralysis:[]
The affected Ponymon's speed is lowered by 75% and has a 25% chance of doing nothing each turn. This means that it's very likely to move last.
Sleep[]
The affected Ponymon cannot perform any action for 1 to 5 turns. Each turn it has a chance of waking up and moving.
Burned:[]
The affected Ponymon recieves damage equal to a 1/8 of it's total HP at the end of each turn. Its attack stat is also halved.
Frozen[]
The Ponymon cannot perform any action. Every turn it has a 20% chance of defrosting unless it's raining or hailing. In those cases it's impossible to defrost. If there is a sunny day it's impossible to cause this status, but it doesn't provide faster defrosting.
Poisoned:[]
The affected Ponymon loses 1/8 of it's total HP every turn. In the overworld, the Ponymon will lose 1 HP for every four steps the player takes.
Bad poison:[]
There is also Bad posion status which damages the Ponymon by 1/16 of its total hp then increases 1/16 each turn (first turn 1/16, second 2/16 third 3/16, etc.). Since the whole movepool is not released yet, I can't tell which moves produces one status or the other. However it is good to know that if a Ponymon with bad poisoning is changed during battle or the battle ends the status changes to normal poisoning.
Volatile[]
birds, makes sense...
Confusion:[]
If the Ponymon is confused it has a 50% chance of hurting itself with a damage of 40 by physical attack. It last from 1 to four attacking turns, this means that if the Ponymon lost a turn and doesn't try to attack (like being paralysed), it won't affect the counter.
Infatuated[]
An enamored Ponymon cannot attack 50% of the time. Contrary to popular belief, it won't attack even if the enemy is not the one that inflicted the status.
Flinch[]
Flinching prevents the ponymon from moving in its turn. This happens when moves cappable of flinching such as Hoof Stomp hit the pony and the effect triggers.