The thing with Dialgachomp is that the deck heavily relies on drawpower as opposed to other sp decks (naki nailed it), and as I play the deck I generally either draw all my sp metals or I do not, i.e. it can be extremely inconsistent in grabbing the SP Meatls, although this will change with energy exchange unit. The reason I play dialgachomp > Luxchomp is because Dialgachomp's win conditions are always set in stone. Once you get Dialga setup, GG. No deck can withstand Deafening for 30, shutting down bodies, locking trainers, and a big attack that nails for 100 along with lost zoning energy, not to mention that Dialga's a tank. Luxchomp is faster but can be KO'd that much easier. Dialgachomp also autowins vs Shuppet so that's a nice thing to have, a guaranteed autowin.
Dialgachomp can beat Charizard, you just have to have good tactics and know when to spray. Charizard decks rely on draw and power spray can shut that down very easily. Charizard may see play in BR's, but it will die out again. Too weak of a deck to withstand the format, (sp runs all over it). On Quagsire, that's not a great tech anyways. You'd still be giving up a prize to charizard each time and not OHKO'ing it unless you belt, which is the stupidest desperation tactic, i'd rather belt a Tyrogue.
In my honest opinion Dialgachomp will continue to do well because it has no problem fitting in 5 cards to beat machamp, as well as still locking and with less drawpower trainer lock will hurt alot more.
