This is the first time I have tried to answer a strategy question but here I go
you would need to teach hitmontop toxic just in case someone would try to resist close combat and just in case blissy uses softboiled and if it uses refresh you would have an extra turn to hit it hard.Although if hitmontop has technician it would help a lot.Having thief will be helpful because of ghost types resisting close combat and since I am pretty sure blisseys normally hold leftovers I think.....