Unfortunately, Venusaur is probably a no. Poison is actually a decent option for him on defense since it counters Fire, but on offense it takes away all your advantages (whole point of him is to counter water) and vine whip is def the offensive move.
Poliwrath is a yes, that's actually a great matchup for him on defense since it counters grass and dragon, 2 of the most likely types to be attacking him. Not to mention flying, another type weakness for him.
Jolteon no - there aren't really any electric mons worth putting dust into at the moment. They're only used for training gyms due to low cp