Upside Downside was created in 1986.
On the Downside was created in 2000.
Downside Abbey was created in 1605.
Downside Up was created in 1978.
Up on the Downside was created on 2001-03-26.
The word upside is a noun. It is the favourable side to something that is also unfavourable.
On the upside, it is ideal for toning your abs, on the downside, it is a little pricy for its functions.
"Every rose has its downside," is an example of mixed metaphores. "Every rose has its thorns" and "Every upside has its downside," are two popular sayings, which have roughly the same meaning. However if you insist on using your example then... He often mixed his metaphores and was fond of saying 'every rose has its downside.'
Upside Down was created in 1979.
Down on the Upside was created in 1995-11.
The Upside-Down Kingdom was created in 1978.
Upside Down Bluejay was created in 2004.
Upside Down - book - was created in 1998.