I want to give my two cents on
.
TL;DR
BAN it.
Rain is flooding the ladder, tournaments, and even the forum discussions because of archaludon. I've used arch on and off rain teams. Arch is generally a solid mon without rain but under rain it practically violates the Geneva convention. It
will trade 2 for 1 or better most games, and if not, there's still 4 other rain abusers to take down. Just because something is only broken with a specific condition shouldn't mean that we should preserve it. Eg. Gen 5 sand rush + sand stream ban and Sneasler ban.
'Oh but it's not arch that's the problem, it's rain as a whole!'
Then why has rain become the #1 archetype after being generally considered 'unviable' or at best, 'unreliable'? Hmm, which pokemon was released in the indigo disk that directly abuses rain? Archaludon is the one who allows rain to be so centralising. All of the other components of rain are replaceable; Archaldon is the unique place that allows rain dominate the way it currently is.
'But clodsire checks it!'
A) Clod does not check eq arch, nor the tera dragon set that has been mentioned, and can be accounted for with the 6th slot on rain teams, eg. Kingambit, who beats clod. Random stuff like psychic fangs barraskewda can be used if the rain user is really scared of clod.
B) Whenever something that belongs in a lower tier crops up into top 10 in tournament usage, there is a problem. See Tauros-Blaze to check Chien-Pao. It goes to show the constraint on teambuilding that arch has, since clod is pretty passive and can be deadweight in non-rain matchups.
By banning arch progress can be made in the OU tier. Change is a necessity to prevent OU from being boring and unplayable. Those who would vote DNB are voting for a tier that no-one would ever want to play. It would be a repeat of Gen 5 OU in a way, and some already think of the current tier like that. Something needs to happen to find relative stability in the tier, and here is the opportunity for change.
'But there are bigger fish to fry!'
Then wait for the bigger fish's suspect test! Just because you might believe arch is the 2nd or 3rd or whatever most problematic mon in the tier doesn't mean it is not broken or unbalanced. Problematic Pokemon should be removed from the tier, and I struggle to believe anyone with proper experience can say in good faith that archaludon is not at all unbalanced in any way, whether that way be in the teambuilder, in the match, in terms of the stranglehold it has on the meta, or forcing clodsire on teams it shouldn't be on.
To summarise: Even if archaludon may not be an individually unreasonably strong behemoth like, for example, terapagos, it is still banworthy for its unreasonable ability to trade, ability to tech itself to beat 'checks', and the dominance of the metagame that is evidently existent as shown by tournament stats and the unhappiness that many top players and others have. I personally cannot see a reason to not ban it, as it can only do good for the metagame, and rain would not be unviable since it has raging bolt, and it will be able to grow and develop as a playstyle, as can the rest of the metagame. If Archaludon gets banned, progress can be made in the development of the tier. If it remains, the metagame will stagnate until something gets banned. Please, vote
BAN.