since it is a psychic Pokemon alakazam is weak to dark types, ghost types and bug types. any Pokemon from that category is a good match against it, but be careful as alakazam can learn focus punch and focus blast, which are deadly to dark types, also alakazam has high stats being the king of psychic types in generation one. personally i would chose butterfree as it's sleep powder would make alakazam fall asleep and the bug moves would greatly affect it. however there is a flaw if the alakazam has synchronise as it's ability because then you will be affected by the status moves you induce on it. so go with a strong ghost type such as banette or gengar to combat alakazam.
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Machamp is a fighting type Pokemon all fighting Pokemon are weak against flying types and psychic types that use flying type and psychic type moves so Pokemon like pidgeot or alakazam will do good against machamp.
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.
there weak against grass, water and ice.