A startegy good for this battle is to change the weather. I heard typhlosion is good with eruption. Also bulky poison types are good for this fight like garbodor
I think graveler can work for some of this fight (which they are underneath the grand stairway) and numel not too good due to rain dance. Slugma also works well just be careful of the anorith and araquanid. (Its mostly just the rock moves)
You have to go west of the the train station where you went to goldenwood forerst and go through a path and find a factory that is where you should find karina or whatever her name is
The quest goes either tanzan meteor base or glass sation then to beryl ward cemetry then the house he lives in the video. From there you can do the quest
I think there was post with the same issue. It was like where the parent of the pichu was a alolan raichu, but it didnt evovle. I dont remember too much of it, that could be the issue
btw you could have evovled piloswine befoure you went to agate city from the move relearner.
I think staraptor can do well. Its fast and can deal damage with brave bird and close combat.
I was looking through the Rejuvenation Folder and was in the pictures folder and found a picture called "FlorinExecution" and was curious what this was cause Ive played through the game and have never seen this scene
FlorinExecution.bmp