>>50895723https://www.reddit.com/r/TheSilphRoad/comments/vu5rvu/analysis_6th_anniversary_event_community_day/Basically if it's a Kanto or Hoenn starter, it's really good.
Shadow Venusaur with Frenzy Plant is actually the highest DPS grass attacker now, and may only be dethroned by Mega Sceptile.
I lucked out and got a 14/14/14 Shadow Bulbasaur earlier.
Also just look at tier lists for whether or not they're useful in PvP.
https://gamepress.gg/pokemongo/great-league-pvp-tier-listMeganium is really good in Great League, for example.