Hahahahahaha! Only that guy knows what he was talking about? I can only say that in my whole life, two of my major decks (that means that I have playtested it for more than 100 times, no joking. Maybe not the second one but the first, yes) were: Salamence ex PK and Ryperior with Rayquaza C. Both uses the technique to discard cards from the deck to do massive damage. By my experience, I can only say that I use those pokemons in the middle of the game, where everything that I needed was on the field, because once I started attacking, I have high risk of getting the needed cards discarded. Trust me, it is impossible to really get delcatty if you goal is to start attacking with Mew on the second turn.
I totally agree with Aburame Yuki. I guess drawing a Turner would give me more damage than wait until getting Delcatty out. Unless, which might be a good idea, to put like a 3-3 line of delcatty, which will allow you to do like 200 per turn. Then, you have more chance to bring those out, as you are probably going to start with 1 or 2 skitties.
@cpeterik
Yeah, exactly, take it from the group it has been created: for a full Ryperior deck, which will do a constant 100 damage with Delcatty by turn 4, as it is a stage 3. All that will give you enough time to get Delcatty out. Plus, it is a evolution deck, which will mostly include Bebes and things that are good for Evolutions. Compare it with Mewperior, which is a Basic deck, which will only include Pokemon Collectors, Great balls and other stuff to get basic out and fast. And, Oh my god! You do mostly 150 damage per turn and you still need to have a Garchomp C counter. And plus, by attaching three energies on it (maybe two with DCE) and loss damage output for mew.