I know that Greninja is the main deck that can function w/out Lele, but are there any others that don't need, or could function at a tournament level w/out it?
Sylve is semi-tourney level, depends on how you play it.The only deck I can think of that Lele wouldn't improve is Quad Sylveon. As for wether or not Sylveon is a tournament level deck, I'm not so sure.
I play Lapras gx online without Lele. As mentioned Lele can help to improve consistency from bad draws....However Lapras does have luxury of drawing 3 more cards.
No not out of necessity, I just find with Lapras draw ability that Lele not an absolute requirement, plus when I was running one or two vs 4 Lapras it seemed like every game I played I started with one of my Lele which was very frustrating. So I removed them from deck.Do you play it this way out of necessity or just chose not to include Lele in the deck? I play a turbo lapras deck in expanded with 3 Lele and find it to be critical to the deck's success, especially when you can't get a manaphy on the bench and need to pull a guzma to rotate your Lapras and keep hitting every turn.