Hey ! so first thing to point out is that the rmt rules indicate that you should have at least a 3 line description on each pokemon for the rmt to be kept open.
onto the actual team, what you have there is called THALK. THALK is:
T: Thundurus
H: Heatran
A: Amoonguss
L: Landorus-therian
K: Kangaskhan-mega
this is the most classical doubles ou team format that I know of, actually. THALK generally has latios contested as the most viable last member of the team, tho you seem to have milotic.
However the sets you have arent quite the standard ones. Kangaskhan has protect here, but i recommend
fake out. The reason behind this is that protect kangaskhan's niche is when you have a transform user with it, and kangaskhan uses power-up-punch. protect is not bad on its own, but the fake out support gives good opportunities, like faking out slower things like hariyama/scrafty/hitmontop, fake outing a ghost trick room setter like jellicent , or the rare dusclops, sometimes aegislash (who gets stuck in attack form), or portentially breaking a gengar's sash. it also gives a substitue opportunity for heatran, and landorus a chance to u-turn and gaining good momentum. low kick/power-up-punch is a choice, so both work. seimic toss is sometimes used too.
Heatran is running hp over spAtk, which i personally dont like, but its just me. i dont like having a weaker heatwave since the spred damage nerf in the doubles format alone is too big for me. I advise against this.
Earth power>flash cannon is my main change though. you're going to tell me about how the team is very fairy weak, and it's true, its vulnerable to fairies, but I think heatran's presence alone is enough to discourage them, flash cannon not really affecting much of what heatran's going to do. On the other hand, you lose heatran mirrors very easily, lose the ability to catch a volcanion switch with a predicted earth power, and ground coverage is just more solid than steel coverage. I also dont like timid heatran for the same reason I disagree with the hp investement, but it is a thing that I acknowledge exists in the meta.
Amoonguss looks pretty standard, tho i'd prefer the
physically defensive variant because you already have milotic covering the spDef department. It also helps sponging Kangaskhan-mega's attacks a lot better, which you run rocky helmet to further discourage. rocky helmet+physical bulk is good.
I'm not a personal fan of milotic since i find it too passive for doubles, and more suited for vgc where if they choose landorus, he'll be coming in more often, allowing competitive to be a lot better. Indeed, your set is mostly a speed control one, with some evs that I have no clue what they do, so im not going to give any advice here. Maybe do try
latios instead.
Thundurus 252 SpDef are something quite new to me, as i've seen bulky thundurus, offensive thundurus, and even in between thundurus, diancie check thundurus even, but not a spdef one. i am not quite sure what it accomplishes, but i really recomend the standard bulky one, for its more well-rounded performance. It seems to me more that spDef thundurus could be hard to have it carry it's own weight in particuarly physical match-ups, and not so well performing offensively in others. the moveset is fine tho, so yeah mostly
standard bulky thundurus would be my choice
Landorus-therian is the iconic doubles ou pokemon, and it's just fine on this team. My personal preference is to run
184 Speed EVs for two reasons:
-Landorus-therian aquires a slower uturn that's still faster than most pokemon, allowing you to grab momentum when there are two landorus in the feild, and they both click uturn. going last means having the choice of sending out a pokemon that handles both of what the opponent has on the field, having used up their "uturn". faster landorus mostly is for rocksliding other landoruses first, fishing for a mirror match win, and in desperate cases flinches, which I am not a fan of in either cases, since I dont 1v1 landorus with my own landorus, nor do I like resorting to that (even if I admit doing it when I find it my biggest chance to win)
-184 speed evs let it outspeed gengar-mega, according to
Yellow Paint which I find to be the fastest relevant pokemon to prepare for in the meta. there is deoxys-attack, but I dont find it worth it maxing speed just to prepare for one single pokemon (that you're gonna only end up breaking's sash with u turn anyways)
Sooo overall, it's classic THALK, but the evs on the pokemon renders this version a bit too passive, at least for me, which I would recommend changing. remember to add 3 line descriptions per pokemon dude, and goodluck in your adventures the doubles format !
PS: should you need anything, I hang out in the doubles ou room and would be happy to help if I can. have a good day! :)