As I promised. This team does have a refined finish and strategy to it, and I can see why you placed 65th on the Pokemon Online ladder. I have some comments here and there.
Upon some investigation, Ludicolo does seem redundant alongside a specially-oriented Kingdra since Kingdra destroys practically everything with double boosted Hydro Pump + Dragon STAB. If a Pokemon not hit with the deadly Hydro Pump, then it's possible death by Draco Meteor. You should consider keeping Special Kingdra because it's simply a "better Lati@s" in the rain, and since you seem to have no apparent abhorrence to Blissey, no mixed Kingdra. I personally learned that it misses out on a few KOs and is exactly the kind of Pokemon Dragon Tail Gyarados is looking for. (Speaking of which, Rain teas have a tendency to fall to entry hazards and Dragon Tail Gyarados with bulky spreads, so you have to watch out for those)
As far as changes go, I am a bit unsure of myself. If you replace Ludicolo with Nattorei, you are losing major firepower on your team. If I'm thinking of your team correctly, Ludicolo should always be the primary attacker before Kingdra because of its slightly lower Speed and fantastic coverage. Additionally, you could lose a way to keep the pace over enemy Nattorei (Focus Blast), though I see you already have ways to counteract him (provided your switch-in isn't hit by a strand Thunder Wave). On the other hand, Nattorei pretty much solves your opposing Rain team problem by walling most attacks from Rain abusers. It also gives you some convenient entry hazards that allows the other five to score significant KOs, like a possible 2HKO on Blissey with Kingdra. Due to personal experience, Rain teams tend to have a Nattorei of their own, so it should be relatively easy to switch Breloom and Toxicroak in by baiting.
For your Breloom, is there perhaps a better item other than Leftovers for it to hold? Leftovers does not seem to perfectly suit Breloom here since the team is offensively-oriented. Though this is not that big of an impact on your team, perhaps a Plate or a Lum Berry (for Dark Void and other status moves) shall do? Lum Berry does give Breloom the liberty of setting up in front of Darkrai, Thunder Wave Nattorei, and an unlucky burn from random Boiling Waters.
Also, another small thing that's been tugging me: is Hypnosis actually worth it on Politoed? You already have Spore on Breloom, and it's more than likely that you are going to encounter some slower Pokemon. This may be rather arbitrary, but perhaps Hidden Power Electric can take place of Hypnosis should Genosect faint. It's also a reliable way of getting rid of especially bulky Gyarados, which may phase your team with Dragon Tail and sponge hits. And yeah, Toxic's good, for not a good thing to be locked into.
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