I would avoid :
Most grass types - I get shivers just from the idea of getting sliced from some razor sharp leaves or leaf blades!
Every single poison type - ~.~ the reason is obvious
Rock,steel types - They are too tough and hard to hurt them while they can crush you in the blink of an eye.
Bug types - They are creepy,big bugs..ewwwy
Psychic types - its not my fault if you like your body getting crushed by psychic abilities or being controlled and pushed here and there like a ragdoll.
Ground types - They are mostly quite big and they can either cause earthquakes either open a fissure and throw you inside or bury you alive O.O
Ghost types - ...
Dark types - Stealthy,sneaky assassins who slash you and kill you without hving a clue.
DRAGON types - :"<
Ice types - getting freezed solid or pierced by a beam of freezing air is not something thats in my plans
Flying types - Getting slashed,pecked and your eyes ripped out of their sockets(gruesome as it may sound) is horrible..Just the idea of it..Neither is getting slashed by air,thus without waiting it nice.
Water types - Big sea monsters that can eat you whole and other creatures that can drown you with a surf,or crush your body like a can with a blast of water stronger than 10 fire hoses together(hydro cannon) or 5 times stronger(hydro pump) do NOT have a difference to me..Both deadly.
Fire types - ..You guess why.
Electric types - quite obvious..
I would only approach normal types..AND EVEN THEN ONLY if they were chained..Normal types have claws that can slash you and rip you apart and fangs that can crush your body and make you suffer a lot.
.
.
.
Not to mention fighting types. :/