It is weak against Bug type and Fighting type moves....
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they are weak against dark type Pokemon such as umbreon, or murkrow with moves such as bite or crunch
Since Umbreon is a Dark Pokemon, then use Fighting or Bug-Type moves against it
Lots of pokemon types can be weak against one but, obviously, the basics are,Grass is weak against fire, fire is weak against water, water is weak against grass, water is weak against electric, metal is weak against fire, normal is weak against dark, dark is weak against poison, flying is weak against electric, Sorry for boring you, ( I am under the age of 10) XP Thanks for your time :D
It is weak against ground and rock
Bug type Pokemon are weak against Fire, Fighting, and Flying. Not fighting there not weak against fighting types, there weak against Fire, Flying and Rock.