There is a poketch app that will tell you this all but
Flying is weak against:
ground (and the opposite)
flying (")
steel
electric
ice
rock
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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.
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
Serperior is a grass type pokemon, so it is weak to flying type moves.
water flying, if Pokemon is a wall
It is weak to fire, flying, and bug.