Though Paras would be nice in the next few gyms. Good against water, resists electricity, good against and resistant to grass, good against psychic, and good against ground in the last gym. But I'm biased against Butterfree, so ignore what I say.
Biollante is good against water, resistant against electricity. Doesn't have to worry about the poison that every gen 1 grass gets except Paras and Tangela. And good against ground.