Ramblin' Evil Mushroom

Read the stats and strategies for defeating the Ramblin' Evil Mushroom from EarthBound, a game by Shigesato Itoi for the Super NES.
Ramblin' Evil Mushroom's Stats
HP:60
PP:0
Offense:15
Defense:10
Speed:5
Guts:5
Exp:95
Money:$15
Type:Normal
Starts With:Normal
Where it appears:Onett
Ramblin' Evil Mushroom's Resistances
PSI Fire:100% effective
PSI Freeze:100% effective
PSI Flash:50% effective
Paralysis:50% effective
Brainshock:99% effective
Sleep:0% effective
Mirror:50% effective
Additional Ramblin' Evil Mushroom Attributes
SMAAAASH! Probability5%
Run away probability
(add 10 after each turn)		(Highest speed among Ness, Paula, Jeff, and Poo, subtracted by 15)%
Instant win occurs if weakest character's offense is greater than70
Probability that attack will miss12.5%