Glitch

Glitch is a video game virus that swore to destroy every character that comes on his path.

Overview
Glitch is a weird monster, but in a good way. First of all, he got a possession status unique to him which can bypass the possession immunity. Combined with the triple damage given to the monster, you get a very scary monster to face already. Glitch does have a few more tricks such has random effects or nightmares. His stats are great in general, he got a nice trait and he is just, in general, a very powerful monster. Able to give a good number of status effects as well as dealing a good amount of damage. Glitch easily climbed to the A rank and might even go higher as time goes on.

Positives
 * Can possess monsters immune to possession
 * Can make an opposing monster kill it's own team in one hit, thanks to the triple damage.
 * Can inflict a good number of status effects
 * Doesn't have much trouble with cooldowns
 * Good trait

Negatives
 * Moves usually outclassed by other monsters in terms of cooldown, power or effect with the exception of Kill Switch.
 * Can't use it's Dark-typing to his advantage due to low damaging Dark-type moves

Movesets
ERROR 404 Kill switch is an amazing move as it allows you to possess any monster not named Timerion, tho you should be wary that you might only give the triple damage due to the accuracy lost against Hardened and higher traits monsters. Backdoor Intrusion is your best damaging move, got only one turn of cooldown and does heal Glitch a little, which is always good. DD0S gives a random effect to all foes. This move isn't great and is completely outclassed by other monsters such as Master Skeel, but the possibility of getting great status effects is usually worth the shot. Removal Bug removes good effects from the foes. This is especially great against monsters such as General Darmih or Timerion which does boost their team.
 * Backdoor Intrusion
 * Kill Switch
 * DD0S
 * Removal Bug
 * 2 Speed Runes, 1 Power Rune

Counters
Glitch is a Dark-type. So Light monsters such as Lux Aura or General Ingvar do great against him. The later is especially good due to the chance of Kill Switch to fail, thanks to the Tough trait. If you can remove negative status effects, you might want to use that as Glitch's Kill Switch will be a lot less effective.