Honestly, I'm not really sure why Azurril is ranked below Honedge / Aegislash, nor even Charizard. The Gift Lucario I can understand, but definitely not any of these other Pokemon; Azurril is probably the single most ridiculous Pokemon in the game besides gift Lucario (who makes the entire game kind of a joke honestly-- why you would try any Mega besides Lucario is beyond me).
Charmander comes under-leveled, and honestly its performance is inferior to Fletchinder until you get it to Mega Evolve (and even then, Fletchinder's ability to abuse the AMAZING in-game Acrobatics, along with its insane and convenient level up movepool-- I'd say it's the more consistently good choice throughout the game).
I used Hone Edge on my most recent round, and it is pretty damn good too-- its typing is so good, but it needs some significant babying until it gets Shadow Claw and Shadow Sneak (at which point it could probably take the whole game on its own, especially after you get Eviolite).
All that said, Azurril is WAY more monstrous. First, consider that you get Return almost immediately after the point you get it. Even without it liking you that much, Huge Power STAB Return destroys any wild Pokemon and the weak-ass trainers at this point in the game. Also it has Bubble, and destroys wild Litleo, making for a few easy levels (Farfetch'd plus Exp Share gains tons of experience too). The only real trial with Azurril is getting it to like you before level 20 (to ensure you get Aqua Tail) but by the time you get to even level 15, you probably have enough happiness to get it to evolve just by walking back and forth for half an hour (go watch a TV show as you do it). Once you have Marril, it's pretty much GG as far as XY goes-- Marril evolves into Azumarril at level 18, you'll have it before you even get your second badge, and it gets Aqua Tail at level 20 (as Marril) or level 21 (as Azumarril, making the whole do-or-don't evolve question pretty silly).
Aqua Tail + Return + access to the early game Bull Doze is probably stupidly-good-enough already, but Azumarril gets Double Edge almost immediately, and Superpower and Rough Play both get learned at very convenient timing...
Almost nothing in game came survive Azumarril's Huge Power attacks, and pretty much nothing even scratches its 100 / 80 / 80 bulk and awesome defensive typing either. Azumarril's also fully capable of abusing many useful hold items in-game, such as Silk Scarf, and later Splash Plate (also appears pretty early) and is just silly with Leftovers or even Rocky Helmet.
To top this all off Azumarril grows at a FAST rate. With Experience Share, it's almost impossible to grow Azumarril along the same rate as the rest of the team if you have Slow or even Medium growth rate Pokemon. By the time they make it to the next level, Azumarril will have already grown 1, or even 2 levels just through Experience Share-- so unless you've got an entire team of fast rate mons, just expect that Azumarril will always be stupidly over-leveled compared to the rest of your team.
XY offers up a lot of Pokemon that re ridiculously good, but Azumarril is just silly-- definitely S Tier material. It definitely doesn't belong in the same class as Sawk or Bulbasaur... and it's definitely on a higher level than Charmander or Honedge.
Also, I would like to Nominate Gible for B-Tier (though honestly, it's much better than Tyrunt...)
-Availability: Sandy area in route 13, so mid-early, and it's pretty common-- you're pretty much guaranteed to run into multiple as you go through this route. When you meet it, it'll already be above the level needed to evolve, so it'll evolve into Gabite immediately!
-Typing: Dragon / Ground is awesome typing, and even better in-game. You get Gabite IMMEDIATELY before the Electric Gym, which is nifty. Even in the Fairy and Ice gyms, Gabite destroys Mawile and Mr.Mime, and Garchomp can easily OHKO everything on Wulfric's team with Dragon Claw + Fire Blast-- it's kind of sad. Ground is such a good and important typing-- both in-game and out; and I'd say this is probably the best Ground Pokemon to be found anywhere in this game.
-Stats: It's Garchomp. Do I need to say anything more?
-Movepool: Its movepool is stupidly good. It pretty much comes with Dragon Claw, and Bull Doze is a TM you likely have at this point-- not to mention the Dig TM (which it also learns naturally), but honestly Bull Doze is better. It also can use a number of other useful TMs you have at this point like Rock Tomb, Hone Claws, and Aerial Ace. Gible also tends to evolve and get Crunch around the same time you get to the Psychic gym... of course as soon as it evolves you can teach it Swords Dance. Fire Blast is another move you can teach it (though it's not really needed...) and Surf is actually useful for cave battles, as well as bringing utility if you don't have a special attacking water type (easy in this game, when there are so many really good physical attackers to choose from). Bulldoze carries very well until you get the Earthquake TM right before the Elite four.
-Major Battles: Gabite has a natural advantage against most of what Team Flare uses, and obvious stomps their boss flat (just watch out for Gyara's Outrage). Garchomp rips your rival to pieces, and manages to perform well even in the Fairy gym, it's worst gym. Of course, it does amazingly well in the Electric Gym (the one right after you get it) and smashes the Psychic gym with its new-found 130 base Attack and Crunch. Despite being at a type disadvantage, Garchomp sweeps the Ice Gym because Dragon Claw + Fire Blast OHKOs everything he has... of course, Garchomp can take on the entire Elite Four and Champion by itself if it wants to.
-Other: Aside from coming kind of late, and somewhat underleveled, Gible's only other flaw is that it's growth rate is disgustingly slow. Unless you don't care about a major gap in level between your teammates, expect to never ever use any of your fast growers for the rest of the game. Azumarril can sit on your bench and not do ANYTHING as you solo the game with Garchomp and STILL be at a higher level than Garchomp just because of Experience Share.