Mega Charizard X gives both a lot of trouble, however, Mega Audino is able to live a Flare Blitz from Mega Charizard X at +1 which Clefable can also do while running Unaware, but that's a different story. It's a shaky check at this point, but it leaves it room to Thunder Wave it, effectively crippling it. Neither truly fare well against it, but Mega Audino at least has a higher chance than Clefable of pulling off a Thunder Wave. Otherwise, both should not be used to wall Mega Charizard X.
Greninja is a monster lol, its Gunk Shot KOes Clefable from full health; however, Mega Audino will NEVER be OHKOed by Gunk Shot, not even when fully invested. It's interesting to note that Greninja can not 2HKO either with Hydro Pump, so that's something they share in common. Both suffer when fighting Greninja, but Mega Audino is once again able to pull off a Thunder Wave whereas Clefable has no hope of being able to. It's also interesting to note that Greninja has a 50% chance to KO Mega Audino should switch into a Hydro Pump then stomach a Gunk Shot, whereas Clefable is completely destroyed if it attempts to do this. There's also the fact that Greninja has to rely on both moves having 80% accuracy, so a miss could be beneficial to both of these Pokemon and could potentially change the outcome.
but this is suspect so^
This is one Pokemon I was excited to discuss. Keldeo, with Choice Specs Hydro Pump, can not 2HKO Mega Audino without Stealth Rock. Its damage output is 41.9 - 49.7%, just barely missing the cutoff. Even with Stealth Rock, Mega Audino has a chance to live it anyways. Secret Sword will always be doing less damage, but it will never 2HKO even with Stealth Rock. Clefable, on the other hand, is always 2HKOed by Hydro Pump no matter what. This is one crucial Pokemon Mega Audino checks that Clefable is not able to! The one thing is Scald, which no Pokemon particularly enjoys, but Mega Audino does risk the burn chance by switching directly into Scald. It is important to note, though, that Mega Audino can stall it out with Wish and can paralyze it with Thunder Wave, even when burned, thus not losing its ability to check Keldeo. All other sets than Choice Specs flat out lose to Mega Audino.
Latios is effortlessly walled by Mega Audino, which has a tiny chance to avoid the 3HKO even! Clefable, on the other hand, is 2HKOed by Psyshock with the slightest bit of prior damage. Or, should it switch in, it is then left utterly crippled for anything else due to it taking two rounds of Psyshock. Both are fantastic checks, though, but Mega Audino edges out Clefable here by being a 100% solid counter to it.
Azumarill is walled by Mega Audino when not running Choice Band, while Clefable has a possibility to be 2HKOed by Play Rough. Both are absolutely shredded apart by Choice Band Play Rough, however; but what's not honestly? Overall, Mega Audino is a much more solid check to Azumarill then Clefable could ever hope to be.
Mega Audino actually fares a whole lot better than Clefable against Bisharp, as surprising as that may sound! Clefable is absolutely decimated by Iron Head, as it OHKOes nearly all of the time. Mega Audino, on the other hand, is much better suited. It can switch into a Knock Off and then mega evolve, or it can even pivot into Iron Head pre-mega evolution, then abuse Regenerator. This is a wonderful perk it has over Clefable although neither are fantastic against it because it's Bisharp ya know.
Mega Charizard Y is ferocious, neither can truly stand up to them. Mega Audino does fare a lot better, though, because it can live Fire Blast with some room and Thunder Wave it. Though, neither should directly take it on because neither can stomach its hits. Then again, not much can actually live Mega Charizard Y's hits, so I wouldn't hold this against either.
Clefable actually has the edge versus Clefable for its ability to utilize Unaware sets to break through other Magic Guard sets. Mega Audino really can't do much versus Clefable, so giving the win to Clefable here. Clefable versus Clefable is generally not even that great of a matchup, as they just wall each other, but Mega Audino especially sucks against it.
Mega Audino and Clefable both have the capacity to wall Mega Gallade. Both can paralyze and both do a lot with their Fairy-type STAB moves, especially after a Close Combat drop. It's very important to note that pre-mega Audino is a horrible matchup and will almost always get destroyed by its Close Combat, thus making it not always a safe switch in. So, Clefable would edge it out in this regard.
Garchomp loses to both, plain n simple. It can't break through Clefable unless running Life Orb, so that's something I guess, but both wall it really well and threaten it in return with their respective Fairy-type STAB moves. Clefable's Moonblast is much more likely to overcome Garchomp, though, as Mega Audino's Dazzling Gleam is only a 3HKO against standard Garchomp.
Mega Gardevoir can break through Clefable with Hyper Voice, Audino, however, is never 2HKOed by Hyper Voice, not even after Stealth Rock. This is quite an interesting perk that Mega Audino has over Clefable. Mega Gardevoir hates Thunder Wave, though Substitute variants fare very well against both. Though, if Mega Audino is running Hyper Voice, it can wear down Mega Gardevoir. It's an //ok// matchup against both, really.
Mega Audino is immune to Shadow Ball, whereas Clefable is not. Gengar hates Thunder Wave, though its Stallbreaker set is quite ugly for both Mega Audino and Clefable. Plus, any Gengar running Sludge Bomb threatens both of them, so Gengar will usually beat both Clefable and Mega Audino in these cases. Unless Mega Audino has not mega evolved, then it stands a chance, though.
Heatran indefinitely walls both, especially SubToxic, though Mega Audino can actually stomach a Flash Cannon from Scarf Heatran whereas Clefable is 2HKOed right away. At this point, Mega Audino can paralyze it via Thunder Wave. Neither particularly enjoy burns from Lava Plume on defensive sets, and must be careful to avoid these, but other than that both fare quite well in a wall versus wall situation against defensively-oriented sets.
Invested Earthquake can beat Clefable, but not Mega Audino. Both beat Landorus-T in general, though, so it's not really that much of a comparison. It's important to note that with prediction, Superpower can smack pre-mega Audino and thus KO it before it has a chance to mega evolve. Though, after mega evolving, Superpwoer will not do anywhere near as much damage and can then be Wish stalled.
Landorus deserves a special mention because Mega Audino is 3HKOed by Earth Power, whereas Clefable is 2HKOed by it, making Mega Audino the far better check. In return, though, neither can do
that much but Mega Audino still is fat enough to wall it so it wins here. This is very helpful for stall teams, although they have easier times nowawadys, but an additional counter is always appreciated!
Latias is basically a worse Latios in this situation, being even weaker than Latios with its own Psyshock. Roost is helpful here and Latias can stomach both Fairy-type STAB moves, but absolutely hates Thunder Wave. Mega Latias with Substitute does ultimately win, however, as Calm Mind to boost and allow it to stomach Fairy-type moves, and Substitute to block Thunder Wave, eventually will overcome Mega Audino and Clefable both.
Mega Metagross ;_;. Beats both quite easily with its insanely strong Meteor Mash, the only hope both of them have is to catch it on the switch with Thunder Wave, which no good player will do. Meteor Mash misses come in handy in this matchup, but one should never rely on this. The one exception is pre-mega Audino, which has ~50% chance to be 2HKOed by Meteor Mash, but it's still shaky.
Mew is just irritating with its stallbreaker set, can't do much in return but Will-O-Wisp. Though, Clefable doesn't enjoy Knock Off, while Mega Audino doesn't mind one bit. Will-O-Wisp in general is bothersome, along with Taunt, so Mew can ultimately overcome them both in the end; neither of their STAB moves are going to break through Mew anytime soon. Plus, Will-O-Wisp doesn't even bother Clefable; neither ultimately win still, however.
Mega Pinsir has a 67.2% to 2HKO Mega Audino and a 100% chance to 2HKO Clefable, meaning Mega Audino is more likely to be able to paralyze Mega Pinsir via Thunder Wave. Both are decimated by +2 Return, though, but then again, what's not? Mega Audino does have a ~50% chance to be KOed by Return at +2, so a lucky roll can allow it to pull off a Thunder Wave, this should never be relied on though.
Mega Scizor always 2HKOes Clefable, Mega Audino is likely to live the Bullet Punch. Though, neither particularly enjoy it. Fire Blast from both parties can do wonderful versus switch ins, but it's generally not safe due to the risk of Swords Dance. Should a Swords Dance be pulled off, then your team will be in trouble, so Thunder Waving on this turn can be beneficial to make sure Mega Scizor will not receive a free turn to do as it pleases.
Talonflame has a 21.5% chance to 2HKO Mega Audino, Clefable is always 2HKOed; thus making Mega Audino the much better check. This is really relevant because Mega Audino can use Wish stall to overcome Talonflame eventually and actually does quite a bit with Hyper Voice, 2HKOing it after a tiny bit of recoil, Clefable fails to do this.
Thundurus will usually 4HKO Mega Audino and 3HKO Clefable, so both are good checks, though Mega Audino definitely edges out Clefable right here because it can use Wish stalling much more effectively. Mega Audino does a ton better against Nasty Plot Thundurus though, as Clefable is KOed with just a tiny bit of prior damage, though from my experience Nasty Plot isn't as common as it was.
Mega Venusaur beats both via Sludge Bomb, but Mega Audino actually has a slight chance to survive it. However, Mega Venusaur hates regular Audino which walls it to hell and back, and Thunder Wave coming from both. This is where pre-mega Audino really shines, as Sludge Bomb isn't even a guaranteed 3HKO. The risk of poison is apparent, but it's basically just hope not for it. Defensively oriented sets don't fare as well, but will eventually overcome both Clefable and Mega Audino eventually.
