The final battle against Gary at the Pokémon League, which has him using Pikachu against his Jolteon to end the adventure the same way it began, despite an 11-level disadvantage AND the fact that he had Porkchop with a 100 power super-effective attack.
In the battle against N, when he's down to his final Pokémon, Archeops, Devin brings in Marriland (Samurott) against it, and a Stone Edge does about 3/5 of its health. Devin then uses an X Defend, allowing Samurott to survive with 3 HP-almost a CMoA on its own, so he heals up, but just as Samurott is about to restore the glory of the relationship between people and Pokémon, Archeops uses Stone Edge, which gets a critical hit, destroying Samurott's X Defend and knocking it out. He then brings in Wylia (Beheeyem), which gets the Quick Claw activation and knocks out Archeops with a critical hit on Thunderbolt, winning the battle.
In his Japanese White 2 version (which he used to write the walkthrough), he uploaded the Elite Four and Champion on Challenge Mode. There were two CMoAs in the Champion battle: first, Iris' Hydreigon OHKO's his Crobat while confused, with a critical hit Dragon Pulse. After knocking it out, his Serperior sets up Reflect, only for her Aggron to speed up with Autotomize, and break through it with a critical hit, knocking it out. He then revives it, and after doing a little less than half its health with Giga Drain, he then scores a critical hit with Leaf Blade and knocks it out just before his Reflect wears off. The second one is when his Metagross gets an attack boost with Meteor Mash against her Lapras, then sweeps her team with it (surviving her last one with 18 or so HP).
He gives his Pokemon "bro badges" whenever they pull off one of these in a cinch of what would be extremely close to a death, or along those lines. Here are all the bro badges he has given, in order:
Omelette (Illumise): After Devin desperately looks for something to do against Wattson's Magneton after it kills Waffles (Combusken), he spends around 20 minutes stalling it out of PP for all its attacking moves, and manages to knock it out, even while paralyzed and with no healing items left. It also puts the final blow on that Manectric.
Sushi (Tentacool): Gives his life against Wattson's Manectric, but not without poisoning it with Poison Sting, confusing it with Supersonic and lowering its Defense with Acid, all three of which were critical to knocking out the Manectric.
Pizza (Dustox): Similarly helped to stall out the Magneton much like Omelette did. Also used Protect to stall out Norman's Slaking. Similarly, he also used Protect at just the time when Wattson's Voltorb used Selfdestruct.
Frittata (Crobat): After Norman's Belly Drummed Linoone knocks Couscous (Graveler) out with a critical hit on Facade, Frittata survives it with 4 HP left, allowing him to knock it out.
Fries (Linoone): Against Winona, survives a critical hit Earthquake after a Dragon Dance with 3 HP, allowing him to 2HKO her with Ice Beam. In the past three gym battles prior to this, he had had four deaths, three of which were due to critical hits.
Spaghetti (Gyarados): In a double battle at the end of Victory Road, survives a Slaking's unexpected Thunderbolt with 21 HP.
Taquito (Magneton): While not specifically mentioned what earned it the bro badge, it did survive an Endeavor in the Fortree Gym and hold its own for a bit against Drake.
The fight against Wattson, in general. Stalling that Magneton out for 20 minutes and several Contrived Coincidences (namely with Sushi, as shown above) still leading to victory in a horribly desperate situation, earning THREE Pokémon their bro badges.
In Episode 49 "Victory Road: The Movie!", Devin is faced with a Torkoal that has used Amnesia, but Spaghetti uses Surf and gets a critical hit, breaking through that and OHKO'ing it. He then says that Spaghetti avenged Potato (Swalot, died against Flannery's Torkoal from a critical hit on Overheat in sunlight with +4 Sp Def) in doing so.
Getting Lasagna, a pokémon with THREE perfect IVs, off of a random wild encounter. Without breeding for RNG manipulation, the odds of a pokémon getting three perfect IVs are 1 in 32768. To add to the awesomeness, the Nuzlocke rules limit the number of captures to one per area, and he was lucky enough to get this as his FIRST ENCOUNTER.
Battling Tate and Liza in Episode 44 "Double Trouble!" and using Spaghetti and Lasagna to make them look pathetic.
He gets a minor one in the comments of Episode 45 1/2 of Emerald "Today's Tragedy..." where he calls someone out for being selfish and only caring about the fact that there wasn't going to be a video after the Sandy Hook shooting, saying that he only wants to do his series for "real fans" after that.
Plum (Gengar): Beats Chuck's Poliwrath after stalling it out for around eight minutes, between confusing it, it having Hypnosis, and being out of Awakenings, along with many close calls, and not a single critical hit, to boot.
Turnip (Feraligatr): After Pear (Victreebel)'s life is taken at the hands of the Double Team on Route 47 with Electabuzz and Magmar, Marriland brings out Turnip (as a Croconaw), and the Electabuzz uses Thunderbolt, but Turnip survives with ONE HIT POINT!!!!!!!!!!!!!!!!!!! This allows him to gang up on the Electabuzz with Turnip and Carrot (Raticate), and knock it out, just in time for Turnip to reach Level 30 and evolve into Feraligatr. To think that it was one hit point away from dying when it was just about to evolve makes it even more amazing. It also survives a critical hit from the Kimono Girls' Espeon with 1 HP, then gets a critical hit Crunch to OHKO it.
Peach (Primeape): Weakens the Vaporeon in the Kimono Girls fight with Screech, survives Last Resort with 3 HP after Swaggering it, and 2HKO's it with Karate Chop to win the battle-and the set of the five.
Cauliflower (Dewgong): As a Seel, tanks Ho-Oh with Water Sport and Thick Fat, allowing it to take Sacred Fire and Fire Blast like nothing. It even survives a critical hit Extra Sensory with 9 HP, and knocks out Ho-Oh in three hits of Waterfall (the last one while burned, to boot).
Carrot (Raticate): While it is not specifically mentioned what earned the bro badge, Part 56 had Marriland state that Carrot had an entire wall of bro badges. In that same episode, while Arms' Alakazam has Reflect up, Carrot uses Crunch to get it to half and lower its Defense, then after Crunch is disabled, Headbutt still takes it out (after taking a Psychic for roughly half and the Special Defense drop) thanks to the Defense drop.
Even though episode 31 "One Last Dance!" has him losing two of his three pairs, his Pokémon fought bravely. Turnip not only survived the Espeon's critical hit Psychic, with 1 HP AGAIN, but survived with 4 HP then got a critical hit on it with Crunch, knocking it out. Then, after the Jolteon uses Double Team and takes Plum, Turnip AND Scallion (Tauros), Grape (Jumpluff) saves the day against it. While Grape comes to her untimely end against the Vaporeon, Peach uses Screech to half its Defense, uses Swagger which doubles its Attack, and survives Last Resort with 3 HP, allowing Peach to 2HKO it with Karate Chop. To add on to that, the final sendoff he gave the four was beautiful. The fact that he even won with only two Pokémon remaining is definitely an applause-worthy moment. It rivals the Wattson battle for most epic victory he's pulled in a Nuzlocke.
Getting through the entire Elite Four + Champion without anyone from his team dying.
Will wasn't anything of major significance, but first, against Koga, Banana (Kingler) beats his Forretress to the punch with Crabhammer before it can explode, then gets a critical hit against the Venomoth with Crabhammer, OHKO'ing it.
Next up against Bruno, Spinach (Nidoking) gets another critical hit against Hitmontop, OHKO'ing it before it can use Counter, which very well could have been fatal had it not been for that (though that did not come to his attention at all during the battle, someone did bring it up in the comments). Then, at the end of the battle, Banana, thanks to No Guard, OHKO's the Machamp with Guillotine. Even better because Bruno was the one many people saw him having the hardest time with (at least out of the Elite Four, Lance may have been a different story).
After that was Karen. After Carrot (Raticate)'s Chople Berry (which he had planned for Gengar's Focus Blast) gets Plucked by Murkrow, he uses Swagger with Peach, and after switching in Carrot, Gengar misses with Focus Blast twice, allowing Carrot to get in a Crunch. Peach then Swaggers it up to +6 Attack, and it eventually does hit itself and get knocked out. (The self-KO preventing it from pulling a Taking You with Me with Destiny Bond, which would have got Carrot earlier had Marriland not switched out) And against the Vileplume, Pluck doesn't even do half, but despite getting paralyzed and stopped one turn, it takes out Vileplume the next turn thanks to Guts.
Finally, to top it all off, against Lance, Spinach hits twice in a row with Blizzard against the Dragonites without Hail, OHKO'ing them both. It gets a little awkward against the Aerodactyl when he misses with Blizzard and drops to 0 PP and then is forced to use Struggle thanks to holding Choice Specs, but his entire team still escapes all alive.
Firebutt (Monferno): Took a critical hit Night Slash from Jupiter's Skuntank while it was down on health and yet still managed to live by 2 HP.
Heck, the fact that he's gone through the first four badges so far with only one death (that was due to Horn Drill, so it wasn't even his fault) is a CMOA itself! Keep in mind that in this Muzlocke, he's doing this without the use of items, the battle style on Set (which means he can't switch out a Pokemon before the opponent does) AND with the limitation that his Pokemon's levels cannot go beyond the next Gym Leader's highest level.
