Nearly 60 pokemons in and I haven't gotten one that can see invisible enemies yet, i'm losing my marbles.
Yeah. Only Grumpig, Xatu, and Honchkrow can target them. You can try to stack them on normal enemies and use splash damage such as Lucario or Gardevoir or just spam heal using Breloom, Whimsicott, or Meganium. Those are your best options
there is only 3 but if you have any that can hit for aoe damage those can pick up the invisible guys sometimes