Pardon? No DRE abuse with Leafeon? Who can let you attach two of ANY energy every turn, including specials?
Are you ALWAYS planning on having bodies, no backup plan? No techs at all in the deck? You don't ever plan on attacking with an Espeon or anything like that?
Leafeon doesn't care if the energy is basic or special; it's attack still will do twenty more damage for having the extra DRE on the table. Sounds to me like unless you're running the redundant Togekiss (You already have energy accel. Why waste space in the deck for inconsistant cards with non-useful pre-evolutions?), you're doing more harm then good by not using a few DRE.
Heck, Leafeon decks get screwed PERIOD by Omastar, as long as Omastar never sees the active position. Leafeon LV.X turns into little eevee needing two more turns to start doing its overkill attack again. If you Rare Candied Sceptile... Whoops. Your Claydol or whatever you're using to help set up... Whoops.
Lers take a look at what combo's with Leafeon, shall we?
Blissey, Magmortar, Glaceon (it doesn't, but evidently some people think otherwise), Sceptile
-Blissey gains no benifit from DRE, Scramble is useless, so basically only Boost would be in here (which goes away at the end of the turn, so Omastar does nothing to it).
-DRE lower's Magmortar's bench damaging abilities, so playing it with him is just =/ (even though using him over Blissey is still bad). Again, Scramble is useless because the speed you should be powering up Magmortar means things die quickly.
-Glaceon deals bench damage as well, meaning DRE hurts it alot too. Again, fast damage dealing=Useless Scramble.
-Sceptile turns your grass into double grass, meaning using DRE is silly.
Anything I missed? The way I see it, nothing Leafeon works well with goes with DRE and/or Scramble.