About Lombre, I'm sure you can still catch it at the lake in Whispy Path but I don't know the conditions for the event ( if there are any ). And if you have the patience for it, you can breed a Seel with Stockpile to try stalling, since Dewgong learns Aqua Ring. You could also breed a Seel with Sleep Talk for a RestTalk set, but I'm not sure if you can obtain Leftovers at this stage of the game. And can't you also catch a Wooper? Not only Quagsire is Ground/Water, but Wooper can learn Recover and Stockpile through breeding. Sorry about the messy answer, it's been some time since I last played Rejuvenation.