Deflation, that is prices going down, is nearly always bad for the economy. People stop spending as they can buy more tomorrow by keeping their money at home than spending today. People spending less = economic slowdown, recession etc.
Too much inflation is also bad but governments generally target 2-3%, which is healthy.
Wages do generally go up with inflation (which would entail a zero net gain in purchasing power, which is what actually matters.)
Inflation helps to lubricate the jobs market by allowing a nominal wage reduction i.e. wages go up 3% when inflation is 4% as employees are more likely to accept this than an outright wage reduction.
Wage reductions are necessary during a recession, or unemployment will rise.
Source: what I can remember from my macroeconomics course.