Pokemon Battle Simulators?

Is there such a thing as a battle simulator that will allow you to see the most statistical outcome between a battle of two pokemon? Like a website where I input the names of two pokemon, their levels, and their movesets, and then shows me the statistical outcome?

(I'm asking because I want to know my probability of success if I have a Jumpluff take on an army of Weezings and Grimers alone >_> )

Thanks

Also...I think I posted this in the wrong forum. Sorry :(

I'm not sure about the 'outcome', but you could probably try using a damage calculator, which works by using a percentage on how much damage is dealt to the opposing Pokemon. The damage calculator can be found here.