For the last three slimes you need to level a Slinyo up to level 20 and go into the monster farm to get an event where you can evolve it into any of those three. Then get another Slinyo (which will be level 1) and do it two more times, but you need to release the evolved slime each time, because otherwise the evolution event doesn't trigger.
The Ace of Hearts is in floor 9, in that same room you had to use a smoke-bomb to get past (or just get the H-Scene), check the cards on the top left.
The second Photoshot event requires the Instant Suit, which you can get from doing a quest to someone in the dungeon near the Adventurer Garrison.