I can give you a protean Froakie. Not sure why you want a sap sipper Azumarill considering Huge Power is so much better. I can guess you're trying to make a rain team, but huge power priority aqua jet is the signature move of Azumarill.
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If you guys are interested in Mega Kangaskhan, how it works is that it can use every attack twice, the second time hitting for 50% damage. Essentially every single attack of it is amped by 50%. So even an innocuous move like fake out is quite scary on it. After all, it has super priority and hits for about 60 damage instead of the measly 40. It's got a massive movepool too, with access to things like shadow claw, it's biggest STAB return, flamethrower, etc.
It's quite powerful for this reason. Flexible and reasonably tanky while doing great damage. However, it has a few drawbacks.
1. Every move attacks twice. This can be a benefit, but a smart enemy can juke you really hard by doing things like using King's Shield at that point. Then you just lowered your attack to -4 stages. There's also things like attacking someone with rocky helmet twice or anything else you can imagine.
2. It's not THAT tanky. Either you choose to bulk up or you choose to do damage. It can't specialize in both unlike Tyranitar or Snorlax or Aegislash. Most likely you will choose to get damage on it, leaving its defenses okay... but not amazing. Among the many things that can OHKO it are outrage, high jump kick, focus blast, etc. Furthermore, while 100 speed is great seeing as it outspeeds more than 80% of the population, it won't outspeed dedicated sweepers like Blaziken or Garchomp or Mewtwo or even guys like Lucario or Scizor. The list is quite extensive as anything faster than 100 with a fighting move or can do outrageous damage will blow up Mega Kanghaskan.
Essentially, if any of those guys are in the field, you can't use Mega Kangaskhan or it just feeds. At best you can get off one attack, then you will die.
3. Normal type makes for really shitty attackers. It's only STAB is normal type, and despite having great coverage, it doesn't have any way to supereffective anything. It does good damage over time, but the problem is it generally won't survive long enough to kill something. Furthermore, while it may not be weak to anything other than fighting, it still takes normal damage from everything except ghost.
So again, it's pretty easy to take it down. This isn't no Mewtwo X.
That being said, I still think it's really good. Just you have to be aware of its weaknesses. If someone has a fast fighting type, you need to remove that before you use it. All the other weaknesses can be worked around with given a little imagination and baiting.