And yeah, there's several ways any Venusaur vs Jaroda could pan out. Jaroda could outspeed Venusaur and use Substitute. However more often than not I'd say Jaroda would lose - Venusaur has many common STAB moves at its disposal for SE damage whilst Jaroda can't hit Venusaur with anything for SE damage besides Hidden Power.
I prefer Jaroda in terms of design at the moment though. And I think its speed and dream world ability would make it more useful than Venusaur late-game.