There is quest bug in the pokemon rise game which needs to be fixed because it is creating problem, we can't see what are the quest given to us and we are not able to complete it, please fix it as soon as possible.
Sorry, by mistake I put the bug message here instead of Bug Reports, I dont know how to delete it sorry for this. And got the answer about the quest bug.
quests can still be completed even though the quest log does not tell you the required task. the list of quests in the guides section has accurate info on what tasks are given by quests, but the locations may not be correct.
trial and error based on the number required might help (eg the NPC may tell you "amount remaining: 50" so try catching/fainting anything in the quest thread that requires you to faint/catch 50 of something, then return to the NPC to see if amount remaining has dropped)