There are many types of status effects sleep, plus to physical attack, lower your opponents defense, just to name a few. Here is a nice complete list for each of these effects.
These are all buffs that will raise your attack, defense, accuracy, or remove element type by a certain amount.
Attacks
Skill Name
Type
Power
Accuracy
Power Up
Both
6
100%
Anger
Physical
8
100%
Swell
Elemental
8
100%
Flourish
Elemental
8
100%
Merciless
Both
9
100%
Max Power
Both
9
100%
Ignite
Elemental
11
100%
Hyper power
Both
12
90%
Fury
Physical
14
95%
Merlin's Beard
Elemental
14
100%
Defense
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Type
Power
Accuracy
Sustain
Both
5
100%
Toughen Up
Both
5
100%
Shields Up
Physical
5
100%
Body Armor
Physical
7
100%
Spirit Shield
Elemental
7
100%
Thrive
Both
8
100%
Body Shield
Physical
10
100%
Unbreakable
Both
11
100%
Body Blocker
Physical
13
100%
Sacred Stones
Elemental
13
100%
Accuracy
Skill Name
Power
Accuracy
Laser Focus
+20%
100%
High Focus
+10%
100%
Elements
These types of buffs remove the elemental weakness for that element. For example, if the Miscrit using it is a nature type any fire Miscrit will act as if it were a nature Miscrit.