So, how is Crobat?

I rarely see anyone place fighting or grass types in gyms. Not strong enough to excell against Machamp raids.

If the speed stat was better incorporated into GO, like for example, faster mons having quicker attack cooldowns or higher eps to build up charge moves (so they are more likely to release their charge move before the opposing slower pokemon, imitating the faster mon moving first in the main games) then Crobat and other speedy mons like Electrode and Jolteon might get great buffs. But as it is, Crobat isnt recommended for raids( mediocre attack and hp ) but is fine for attacking gyms

Unfortunately, Crobat is kinda meh, which is a shame because I like him too. Not terrible, but not great either.

His typing does providing him with some strong resistances (.51x damage from Bug, Grass, and Fighting) but none of these are particularly useful against the majority of common gym defenders and raid bosses, limiting his use. That could change in the future though, especially if they also have a double weakness to flying, for example Heracross.

While this is not a recommendation, Crobat does learn Shadowball. You could have some fun against Mewtwo if you dare risk your damage balls

All his moves are super effective to Exeggutor, plus double resistance to grass. I have 2 of them at 1.3k CP, I used them to train against a 2.3k double grass Exeggutor in the old prestiging meta.