Milotic
Looking at its stats and movepool, it seems to be outclassed by Suicune, which has much better physical bulk, has moves like Calm Mind and Tailwind and is faster, while milotic only having higher SpDef and little higher SpAtk.
What makes Milotic not outclassed by suicune is the fact Milotic is only viable pokemon to use incredible ability
Competitive. This, along with great bulk and typing what Milotic has, makes it incredible counters, if not even actually one of the best counters to Intimidate. Milotic is actually huge threat for Intimidate-based teams; it will keep getting those +2 against those teams if it isnt killed quickly, which may result into (if Milotic user is lucky) Milotic sweep, which may be pretty frustating for opponent. Also, even thought it overall has worse movepool than Suicune, it still has usefull moves like Icy Wind, Magic Coat and Recover (tho Protect is possibly better anyway for longetivity).
Milotic has its flaws however. Not just that Suicune may be better for many teams, but the fact it has overall almost nothing against other bulky waters other than HP grass, but its weak coming from base 100 sp atk unless you use something like LO/Specs, latter also being not good on Milotic due to its mediocre movepool.
Definely, C+ seems pretty low for it, especially when its pretty popular and good alternative for Suicune, i say that Milotic should raise straight way to
C+ ===> B+
C+ ===> B-
Mega Altaria
It first may look like outclassed by Sylveon, mostly due to it uses Mega slot unlike Sylveon which also can use items. However this is not fact, and M-Altaria has many niches over Sylveon. It first of all, gets MUCH better coverage than Sylveon, most notably fire coverage like Fire Blast/Heat Wave, also getting access to STAB Draco Meteor. It also has Dragon typing, giving it huge 7 resistances and 1 immunity, actually its alot for non-steel type, however, also having weaknesses to Ice, Fairy and Steel, which all are pretty commonly used attacking moves. Great typing allows M-Altaria to wall common threats like Zard-Y and most of Dragons. In normal form, Altaria is Dragon/Flying, allowing it easily switch onto EQs and grass attacks like Leaf Storm of M-Sceptile. M-Altaria also gets access to Tailwind, very useful support move, giving M-Altaria also access to speed control
M-Altaria, however, has its flaws. Sylveon can do many same things but better, having higher sp atk overall due to it can hold items like Specs, but most importantly,
it doesnt take your mega slot. Still, despite that, Mega Altaria is definely not entirely outclassed by Sylveon. So...
E ===> B-
Mega Audino
Last mentioning this thing. It may have its niches, but like M-Altaria, it takes mega slot when there is pokes that does the job similarly, but unlike M-Altaria, which has lots of niches and is definely viable, this thing, other than its typing and few moves, has not much over Cresselia. Cresselia has actually move bulk, better movepool and MUCH better ability that is not lol useless and luck based, while it can still hold items like Sitrus Berry or Light Clay, and
DOESNT NEED MEGA SLOT. M-Audino, on other hand, only thing that it has over Cresselia is arguably better typing and lol 5 points better sp atk. Its still not the best in the world, as Normal on it is entirely useless, sure, it gives you ghost immunity, but 2 most common ghosts, Gengar and Aegislash, has 2nd STAB that hits M-Audino for SE dmg. It also loses very usefull Fighting-resistance,
and has no usable Normal STAB, so Normal type is totally useless on this thing as for Normal STAB, it gets Hyper Voice, but idk how usefull it is, as its pathetically weak even after STAB.
M-Audino has few interesting moves that Cressy doesnt have, though.
Simple Beam can turn something like Volcarona with Quiver Dance into total monster, basically giving Volcarona (or any QD user) Geomancy that doesnt require Power Herb, and we all know how nasty Xerneas is in Ubers. It also gets Yawn, too, which gives nice sleeping support if you dont have it. Both moves are however mostly gimmicky, so keep this on mind.
Cresselia just does most things better than M-Audino. Unless you hate Cresselia/dont want Psychic type for some reason, or you dont have Mega yet, i honestly dont recommend using this thing. It has its advantages, and its not 100% outclassed, but well...
Its totally not B-rank material...so:
B- ===> C
Honorable mentions:
Heliolisk
Its actually pretty good on certain teams. Its excellent in rain teams for multiple reasons. It has excellent ability as Dry Skin, which not just gives you very usefull Water immunity, but any Water type move heals you. In rain, it also becomes basically an activated Poison Heal. Its one of the few pokes that has Glare, which is arguably better than T-wave now as M-Sceptile and M-Swampert being popular. Unlike most Electric types, it has decent offensive coverage too, like Dark Pulse, Focus Blast and Surf. It also actually walls Aegislash that doesnt carry Sacred Sword. Heliolisk is however frail, VERY frail, its stats overall arent great at all, and there are possibly better Electric types to use.
It sure has a niche though on certain teams.
E ===> C+.
Dragalge
Adaptability is released, so this guy is now atleast viable (yay!). Its speed is fantastic for Trick Room teams. It actually has pretty decent bulk too, so it can few (not so many though) hits. Dragalge gets Hydro Pump, Thunderbolt and Focus Blast as pretty good coverage moves. However, what makes it really effective on Trick Room is...Dat adaptability Draco Meteor. Yep. You heard right. 260 BP move. That reminds me of Hyper Beam Refrigerate Aurorus, but it actually doesnt need to recharge (dat -2 tho). butdatfairywillstopdatubermegaunstoppablemuhdracometeor? Enjoy taking 180 BP SE Sludge Bomb into face...mawile tho walls this thing. However, Dragalge really NEEDS Trick Room to work. Its too slow and pretty bad even with Adaptability outside Trick Room, and not enough bulky. Maybe you could use Follow Me user, but idk, better just put it into Trick Room. And like someone mentioned earlier, Trick Room isnt as viable anymore.
It works only on Trick Room, but its very unigue and has its niche.
E ===> C+
PS: sorry for my not-the-best english