Damn day 12 that was fast,like way too fast.
If you are talking for the prison event,Grodd shows up when you visit Tala,after you catch some level 3 heroines-Supergirl,Wonder Woman or Hawkgirl.
Nope. I had everything done except the ones that wouldn't show up. I didn't have Blackfire, the option to go after Superwoman, or Cheshire. All due to the fact that they literally just didn't show.
Every other capture target was at 100% in her scenes, so I was tossing them into the glamour slams and bordello scenes pretty much at random. Ah, right. I forgot WW bugged after her second or third lasso moment, so I kept getting the same "I won't even use it on you" message and nothing else.
So I finally said screw it and started over. Like I said, though. The grind is nearly torturous. This time I cheated, because there's no way I'm grinding all the money I had again.
And Grodd DID show up when visiting Tala.
I also know this time through that who you have leading a heist matters. So sending Cheetah as the main villain got me all 4 summon relics in 5 heists. So that shortened the Raven grind considerably.
Edit: Maybe I was just lucky. Because the clone tech is not coming that easy. Toyman got a piece in their first, but failed 4 times after. Trying Sinestro now. None of our villains do cloning tech, you know?
Edit2: Sinestro with Toyman as secondary got a clone tech piece every time. Which is odd, because Sinestro has nothing to do with clones, and the only tech he deals with is his ring.