Right at the beginning of the game, the camera follows a cute little Fletchling as it flies through a house. It hovers over the sleeping Player Character, almost looking like it's about to sing you awake... and then it rears back, and wakes you up by divebomb-headbuttingyou in the chest. You later find out it's your mom's.
The game wastes no time in establishing Professor Sycamore's Memetic Sex God reputation in-universe when you get to deliver a letter from him to your mother. It's about the fact that you just received a Pokémon and that you are going to travel across the Kalos region, but the description mentions that the letter is scented with a faint perfume and your mother immediately assumes that it is a love letter, first admiring his lovely handwriting and only then noticing what the letter is actually about.
Shauna not knowing what a Poké Ball is, despite having already gotten her starter Pokémon. Serena/Calem's incredulous response makes it hilarious. "Shauna... What do you think your [starter Pokémon] is inside of right now?"
Shauna: Wow, the Pokémon went INSIDE the Pokeball?!
Just after you have liberated the Kalos Power Plant and Team Flare leaves, the two assistants from Professor Sycamore show up to save the day, only to find out that you beat them to the punch. Hilarity Ensues. The masks they wear to conceal their identity are also... less than convincing.
Even better, after you defeat Team Flare, you learn they were holding off Team Flare's reinforcements with the rest of the Five-Man Band, Tierno calls them by name, they deny it, get angry, and then do their jobs as Professor Sycamore's assistants.
And just prior, Shauna tried to lure away some Team Flare Executives from the protagonist after having a very fake "I don't wanna be chased" and then running away. Two Team Flare Executives do go after her. But... unenthusiastically, one at a time, and at a slow pace while mumbling stuff that makes it clear they're only pursuing her to make sure she didn't trip over a power cord or something on accident that might screw this up.
Even more hilarious, Calem/Serena falls for it hook, line and sinker, chasing after Shauna with more concern than the admins.
Also during the first incident, when you go to the room where all the workers are being held, one of them says how "you're just a kid, how can you save them"; after defeating Team Flare and going back to the room, he says he never doubted you and gives you the TM for Flame Charge.
Yet another funny moment in all this; in that same room, one worker is in between two shelves, and when you talk to him, he says he hid there but got stuck. After beating Team Flare, he's still there and says:
I'm not stuck! It's just that a pleasantly cool breeze drifts through here.
In Sky Battles, even if your Pokémon uses Roost, gets their Levitate skill taken away, is given a heavy Iron Ball, gets frozen, or something like those, that Pokémon can still continue the Sky Battle.
A Maid in Battle Chateau speaks as if it were a Robot Maid instead.
If you're not the sort who gets easily offended, the Battle Chateau is just made of this. Get ready to be called a prole, a plebian, have it suggested that you picked your clothes out in the dark (or from a trash can), be told that you may be a good battler but you'll never be rich, be asked seriously if there's anything else in the world except money, be offered a drink of "dandyism from a dried-up man"... it doesn't stop.
The Marchioness Fiona admits to you after her battle with you that she's a female bodybuilder hiding her muscles under the graceful garb of a Furisode Girl.
Horde Encounters can have some pretty funny moments:
A possible Horde Encounter allows you to fight a horde of Zangoose... With a Seviper mixed in. The Zangoose immediately begin ignoring you in favor of wailing on the Seviper until it goes down. It also works in reverse.
The same happens when you encounter a horde of Durant with one Heatmor mixed in.
It's possible to encounter a horde of four Trevenant... and one Sudowoodo. You're not fooling anybody, Sudowoodo!
When you first enter Lumiose City, the northern half of the city is inaccessible due to a power outage. If you're playing when it's night, it's easy to see the Fridge Logic when the lights behind the Broken Bridge are bright and working perfectly.
Even funnier, the power plant workers will not allow you to pass. However, random NPCs will trot on by with no regard. What makes them so special?!
Klefki's Pokédex entry in X reads:
Klefki's X Pokédex Entry: "These key collectors threaten any attackers by fiercely jingling their keys at them."
Hop on the rollerskates or bicycle while Pokémon-Amie is open. Your Pokémon rolls around in a hilarious manner.
Its movements generally reflect what you are doing. Surf, and it will bob up and down. Mount a Skiddo and it will jerk up and down as if galloping.
A meta example—this Dorkly article (recommended for people who haven't played since the era of Pokémon Red and Blue), serving as a nice compilation of all of the new battling mechanics that have emerged in XY as well as their predecessors (which players are usually tasked with committing to memory if they wish to remain competitively viable).
A woman went on a walk with her Furfrou and allowed it to lead the way. It led her all the way to Couriway Town... from Courmarine City, on the other side of the land! "My feet are killing me" indeed. Bonus points for her actually sitting on a bench, looking a bit lost and with her Furfrou beside her, seemingly unaware of the problem.
In somewhat the same vein, there's a Lass at Route 18 with a level 48 Granbull and Dedenne, who apparently got lost on her way to the Trainer's School and ended up there.
Even after the ancient weapon appears and has been set to destroy civilization in Geosenge Town, you can still call the camera man and take a picture in front of it. Yeah, what a great moment to remember.
...and you can do the same later with the crater it leaves behind when it's destroyed. So much for this tourist spot...
Oh yeah, you know those houses? You would think they'd be piles of wood after the machine appeared. Nope! They're just tipped over like cardboard boxes.
One Hex Maniac, a trainer class that consists mostly rather freaky young women, enters conversation with a Evil Laugh, asking you if you also heard that sound. Once you beat her, she suddenly slips out of character and declares she can't do it, and she ends up lamenting the fact that she has no idea how to act as a Hex Maniac and might not be cut out for that class after all. Makes you wonder, were all the other Hex Maniacs you encountered until then also pretending to be off their rocker just to freak you out?
There is even a Trainer class that pairs them with a Fairy Tale Girl and they are called Mysterious Sisters!
To keep this trend going, the joke is actually rehashed with a Fairy Tale Girl on Victory Road, who just comes and flat out admits that she is burned out on playing "this whole Fairy Tale Girl thing" (yes, she actually refers to the archetype in that manner), and wonders if she should give it up. After the battle, you apparently reassure her of her ability to play the role and she picks up the shtick again.
When you get to Route 14, Shauna gets you, Tierno, and Trevor to go to a supposed Haunted House. It sounds like an analogue to things like the Strange House or Old Chateau. In reality, it's a single home with a man who fails to tell a scary story, which resulted in some hilarious reactions from everybody. Optionally, you can even tip the guy and make the scene more hilarious.
Even better, Tierno apparently spaced out the whole time! This was probably a reference to how much of an anti-climax it was.
The Team Flare grunts are prone to this in spite of their end goals.
In Route 13, when you beat a Grunt at the entrance of the Power Plant, he mentions the exact location of the pass and walks off to wait. The next Grunt you meet afterwards mentions having no idea who you are even though you establish to them your status.
Mr. Mime's animation is hilarious, but at the same time kindacreepy.
The hipsters that refuse to let you enter Route 15 because you're not cool enough to know about Route 15 yet.
In Frost Cavern, there's a hiker that yells in all-caps:
"MY TOES ARE FROZEN!"'
"I CAN'T STOP SHOUTING! I THINK I'LL FREEZE IF I DO!"
Blue has been to the Kalos Region. He got the Bonjour right, but he kept saying "Smell ya later!" when he left.
When you meet the "Defenders of Kalos" in the Team Flare lab, your character seems to say something along the lines of, I Never Told You My Name, because they quickly make a rather lame excuse for knowing it. (Yeah, those guys aren't fooling anyone.)
It can also be funny when you discover a part that hurts you on a cute adorable Pokémon that just begs you to pet it. Such as Pikachu's cheeks or Aurorus's forehead gem.
Even better when you repeatedly hurt yourself on the Pokémon and they start to look at you, incredibly confused.
Pikachu seems to enjoy it when you rub its cheeks. It makes the same face as when you scratch its chin, and lets out an elated cry when you get shocked.
In Pokémon-Amie, try feeding a Pokémon when it is full. It's like trying to feed medicine to a kid when they hilariously turn away from the Poké Puffs in front of them!
Try grabbing a Puff then dropping it. The Pokemon will follow it with its eyes until it hits the ground, after which it'll either give you a confused look (if it's not hungry), get annoyed (if it's somewhat hungry), or get angry (if it's extremely hungry and of a certain species; Hydreigon, Axew, and Goomy being some examples).
You can throw the puffs way offscreen to the left or right through dragging and letting go. After reading The Dev Team Thinks of Everything entries on the main page, you'd probably be half-expecting the Pokémon to fetch... but no, you still only get the Poképuff-following stare.
Playing with any of the more intimidating Pokémon in Pokémon Amie. While some maintain a stoic, badass demeanor (even the relatively cute Umbreon maintains its poker face), others turn into a pile of happiness and cuddles. Including Yveltal, whose reaction is best summed up as "I AM THE GOD OF DESTRUCTION! I WILL SAP ALL LIFE FROM THIS EA....Oooooh, berry Pokepuffs, my favorite!" Which leads to captions like these.
Yveltal makes this specially funny when you compare it to other powerful Pokémon. When you do play or interact with powerful or completely evolved Pokémon, they keep their cool most of the time (Lucario, Blaziken, and Mewtwo are the best examples), even after maxing affection. Yveltal? It acts like the baby Pokémon. It cries in happiness when it sees you or you pet it, smiles when it hears your voice, and watches you with curiosity. It's funny and heartwarming to see the incarnation of desctructionact like a kitten.
Hydreigon is a similar case to Yveltal, being described as a vicious beast that destroys or devours anything that gets in its way or so much as moves, yet in Amie, it becomes extremely adorable, doing happy dances and smiling readily. It'll even offer a "high-five" with its center head by lunging at you in a fearsome manner, but will be thrilled if you tap it while it's doing this.
Amusingly, the vast majority of serious and/or stoic Pokémon are still willing to lighten up and give you a proper smile if you play the face imitating minigame with them and you're asked to make a big smile, which is simultaneously cute and hilarious.
Even the Pokemon who aren't willing to smile can nonetheless be made to look rather hilarious if you can get them imitate you tilting your head to the side and opening your mouth.
Even better, the hiker's running animation kind of makes it look like he's skipping.
The description for the new move Trick-or-Treat: "The user takes the target trick-or-treating. This adds Ghost type to the target's type."
Remember that guy who sells overpriced Fresh Water that costs 300 credits from Pokémon Black 2 and White 2? Well there's another one here in Couriway Town selling it. And if you refuse, he would say that only pros can tell the difference! When you do buy, though, he gives you a free random berry, and starts selling them to you for 100 credits, so it's not a total rip-off like before.
Before the last course in Restaurant Le Wow, instead of the usual waiter/waitress serving you the food, you get a Skiddo carrying the food with a note explaining it in its mouth. Naturally, a flustered server comes running after it shortly after… This is made funnier when the game says the Skiddo appears to be eating the note.
Before you battle Siebold, he asks you if you think Pokémon battles are worthy of being called arts. If you answer No, he goes on a pissed off rant thinking all you want is to "fill your stomach with tasteless matter" before he challenges you.
In Lumiose City, the three battle restaurants are called Le Nah, Le Yeah, and Le Wow. The funniest one is Le Yeah, where all the diners will comment on how acceptable their food is. Not bad, not good, just... acceptable.
Defeating Battle Chatelaines Nita and Morgan in a Multi Battle has Morgan yelling and nagging at Nita, after the latter's Oh Crap and This Is Gonna Suck moment (Before the fight, Nita had boasted about you looking weak and being able to take both of you on at once).
Nita: No, no, no! How could I— This is terrible altogether! How could you do this to me, you wee, rotten Trainers?! Do ye not even know what Morgan'll do to me now?!
Morgan: ... ... ... NITA! Oh, I'll do you, you little waster! First, you mouth off to our guests, with your boasting and insulting them so... And then you lose in battle despite it?! Do you even take this work seriously?! Could you ever face our dear ma and da, rest 'em, after such shocking behavior?! My dear guest... I am deeply sorry for this experience. I beg you will somehow overlook it and come visit our Battle Maison again. Now I must have a... discussion with my wee sister. You'll excuse us...
The Sushi High Roller restaurant has a bunch of Furisode Girls dancing for the customers, except the dance looks like they're just spinning in place. Particularly funny is the girl with a Fletchling, who's also spinning in place.
For a place this expensive to eat at (P500,000 before discounts), veterans of Restaurant Le Wow (P100,000) might expect even better service or exquisite Food Porn descriptions. Nope, the receptionists are Black Belts (as in, sloppily dressed), the food is presented with short and to-the point descriptions, and the waitresses just talk to you casually. It can be funny in how "disappointing" and unsophisticated it is for the price they ask.
Possibly unintentional, but the Kalos Region is visibly based on Northern France, both in its general shape and in some of its locations. What's the water-type starter? A frog. Now what's the other derogatory term for a Frenchman besides Cheese-Eating Surrender Monkeys?
Not to mention that the local pseudo-legendary is partially based on a snail. What's the other Foreign Queasine France is known for?
Froakie resembles Benjamin Franklin. Greninja resembles a ninja. That leaves Frogadier in the transitory middle stage, and as such it looks like a NINJABEN FRANKLIN.
When you defeat the two Team Flare Grunts disguised as a Garcon and Waitress in Lysandre Cafe, they accidentally tell you about the entrance to Lysandre Labs and the password necessary to enter just because they were thinking out loud.
After you defeat Team Flare in Glittering Cave, Calem/Serena will ask a scientist if Team Flare hurt him, and the scientist (who was fine all along) mispronounces their name as "Teemphlair" and asks if it's a Pokemon.
There are certain places where you can't use your roller skates (mostly indoors); Korrina, on the other hand... it's as if she's given a license to use her skates anywhere she wants!
An NPC you can battle in Lumiose City says she misses the face of her love and felt betrayed by his leaving, so she's standing in that position, and wants you to beat her in a Pokémon battle that "it hurts". After you beat her, it turns out that she fell in love with an actor's face on a movie poster and the poster has long since weathered away. She gives you a Destiny Knot afterwards.
There is a maid on the top floor of Hotel Richisimme who won't stop staring at a column, marveled by how thick and long it is.
If you try to have the Stats Judge judge an egg, he says:
Judge an Egg?! That's a tall order even for me!
While it's extremely difficult to achieve, if you show the Stats Judge a Pokémon with 0 IVs in every stat, he first talks about how all of them are its best stats, then describes how bad they all are.
If you don't have enough money to enter Parfum Palace, the butler reluctantly lets you in free of charge.