#1 - Electrode
This pokemon likes to explode itself. If you are next to this pokemon, you will most likely blow up as this pokemon is very suicidal. I have no idea how the species reproduces if they keep blowing themselves up.
#2 - Machamp
This pokemon has really big muscles. It will most likely beat the crap out of you.
#3 - Machoke
This pokemon also has very big muscles.
#4 - Graveler
This pokemon, just like the pokemon from #1 also likes kiling itself. You will explode if you are next to it.
#5 - Primeape
This pokemon looks like a boxer. It probably is one. Also it has anger issues. This monkey will kill you any day of the week.
#6 - Hypno
This pokemon will put you to sleep, completely neutralizing any of your fighting capabilities leaving you vulnerable. After that it could probably kill you.
#7 - Kangaskhan
This pokemon will protect its young child and will go to any lengths to do so. You never want to mess with parents in nature.
#8 - Snorlax
The pokedex says this pokemon will eat anything. It might eat you. It is also on the slightly wider end and will outsize you.
#9 - Gyarados
Gyrados evolves from Magikarp. Magikarps have been looked down upon for their entire lives. The moment they evolve, they seek revenge and will kill everything and is essentially a dragon.
#10 - Beedrill
If you are allergic to bee stings, then this pokemon will definitely be a threat. It can sting you like a bee but unlike a bee it doesn't die when it stings you.