Mega Charizard X
Type: Fire / Dragon
Base Stats: 78 HP / 130 Atk / 111 Def / 130 SpA / 85 SpD / 100 Spe
Ability: Tough Claws (Blaze / Solar Power)
Mega Charizard X is Charizard's second Mega Evolution known at the moment, and its plain to see that the black dragon is just as threatening as its Y counterpart, if not more so, as Mega Charizard X has pretty much everything it needs to be a threatening Dragon Dance sweeper. Dragon Dance boosts both Mega Charizard X's Attack and Speed stats significantly when used, and with the ability to force multiple switches and somewhat beefy 78/111/85 bulk, it's not hard to get at least one Dragon Dance under its belt. On top of this, Mega Charizard X's STAB combination of Fire and Dragon is absolutely fantastic, and only a fair few Pokemon such as Heatran and Azumarill boast the ability to resist the combination, which of course makes its offensive presence quite potent. Combine this with Mega Charizard X's Tough Claws ability, which gives the equivalent of a Life Orb boost to moves Charizard X will be commonly using like Flare Blitz, Dragon Claw, and Outrage, and the ability to restore hp at will with Roost, and you have an absolute monster on your hands, capable of plowing through team after team once set up correctly. Overall, Mega Charizard X is a formidable offensive threat, and its Dragon Dancing prowess makes it a threat to offensive and defensive teams alike
Keldeo
Type: Water / Fighting
Base Stats: 91 HP / 72 Atk / 90 Def / 129 SpA / 90 SpD / 108 Spe
Ability: Justified
With an excellent base 129 Special Attack stat, a high BP STAB in the form of Hydro Pump, and a good Speed tier, Keldeo is a massively powerful Specially offensive threat that should always be prepared for. With a Choice Specs equipped, Keldeo's Hydro Pump becomes a force to be reckoned with, and can punch holes through a large spectrum of teams quite easily. On top of this, Keldeo has access to the exclusive Fighting-type move Secret Sword, which targets the opponent's Defense instead of Special Defense, letting Keldeo easily break past incredibly Specially Bulky Pokemon that might be able to take multiple Hydro Pumps quite easily, such as Goodra, Chansey, and Blissey. Choice Specs isn't the only set Keldeo can effectively run, though, Keldeo can also effectively run a Choice Scarf set, using its boosted Speed to revenge kill a variety of threats such as Mega Gyarados, Mega Tyranitar, Genesect, and Mega Lucario, as well as a Calm Mind set, boosting its Special Attack and Special defense stats in preparation for a game ending sweep, making it somewhat versatile. All in all, Keldeo is an excellent Special Attacker, and should never be underestimated.
(keldeo is wip)