100% Chickorita
So I hatched a 100% Chikorita(lvl 20) and I was wondering what you guys think so the grass event os coming up and I wanted to know of you guys think I should evolve this one when I have enough candies to use as a prestigier or try to evolve my highest cp at that time whenever it is and try to use him as an attacker(Exeggutor is very easy to get in my area I also have an ideal Vileplume)the reason why I'm courious is because I only have one good grass prestigier(Sunflora)

Answers
Earthquake covers poison and fire, while it is not optimal at the moment, IF Niantic were to increase the multIpliers of Super effective and its inverse (NVE) such that SE > STAB, such that it is similar to the main series (yet not the same), THEN it will be a nasty wild card in PvP ;)
Otherwise, like you're response suggests, it is inferior!