Mega Charizard X > Mega Charizard Y
Starmie > Cloyster
Pinsir < Heracross
Mega Mewtwo X > Mega Mewtwo Y
Houndoom > Manectric
Mightyena < Liepard
Aggron < Tyranitar
Sawk > Throh
Slurpuff = Aromatisse (both suck)
Clawitzer = Dragalge
Xerneas = Yveltal
Not to be argumentative, but I kinda disagree with some of these. Since you are comparing the version exclusives, might as well do so myself.
Mega Chariard X < Mega Charizard Y
Fire/Dragon is an amazing type but since its a Mega form, it doesn't really help Chariard out with hazards so the main defense it could muster is kinds moot. It gains weakness to Dragon and keeps weakness to Rock. Loses Fairy and Water, but gains Ground Weakness opening him to EQ spam. While Mega Y still has the same weaknesses as before so you don't even have to change your strategy. With Drought, even weakened as it is, you get an Auto Solar Beam, weaken water attack by half their strength effectively countering your weakness to them, and since its a Special Attacker it can obliterate a lot of Rock and Water types with one turn Solar Beams.
Starmie < Cloyster
Skill Link + Shell Smash + Icicle Spear = rape.
Pinsir = Heracross
Heracross while a dual type seems to be on the bad end of the stick this generation with the new type added in. Both are very good Pokemon however and Pinsir having Mold Breaker gives it an advantage over Pokemon with Defensive abilities.
Mewtwo X < Mewtwo Y
Pure Psychic seems to have my love in this case. Gaining weakness to Flying and Fairy while only losing Dark and Bug weaknesses doesn't sound like an even trade. Even loses Psychic Resistance and makes it a neutral type which isn't beneficial at all to it.
Houndoom > Manetric
Ya. Nothing really to say. Fire devil dog wins with both looks and battle prowess.
Mightyena = Liepard
I can remember a time when everyone and their grandma *****ed about Liepard....now I see it used in OU teams. XD Either way both of these are on the same level for me personally I don't get much use out of either though I can use both all the way through any given game effectively so they are even in my books.
Aggron = Tyranitar
Sure TTar is a Pseudo Legendary, but Aggron has type advantage over it. In direct combat it would be hard to say who would win depending on who has what moveset and items equipped. TTar gets a lot of hype because of his standing but I usually get more use out of Aggron than I do with TTar. Though this doesn't mean that either one has a clear advantage over the other for me.
Sawk < Throh
Guts Throh with what will be a boosted Storm Throw (Always crits) is going to be mean. Though the attack ignores Stat buffs, Guts will make up for any status ailment that inflicts it and can be canceled out if used with Flame Orb to always give it burn status. I don't think Guts' boost is negated by Critical Hit either...so +50% Attack boost with an auto Crit attack.
Slurpuff = Aromatisse
I agree...both suck. My expectations for Fairies had to be lowered because of these two.
Clawitzer < Dragalge
Dragon Type that can put the fairies in their place. Need more be said?
Xerneas = Yveltal
Despite the obvious type advantage, looks wise I prefer Yveltal. I like his attack more as well. Both are on the same level for me though.
apparently froakies hidden ability is protean which changes its type to the type of move it just used
O= Froakie just got more badass!
*See Electric type* Water Type? Nope~ *mud slaps* Now I'm Ground baby~ Oh look Grass type *Aerial Aces* Flying type ***** ~