You must have misunderstood me; I meant to say that of all the common Rain Dance sweepers, (Kabutops, Qwilfish, Gorebyss, Ludicolo Omastar) only Kabutops is an issue. (and Qwilfish I guess) If they have to bring out a Lanturn or a Toxicroak then I've already stopped their attempted Rain sweep, and they've failed.
And on a side note: Who the hell uses Sub Ludicolo and Relincanth? I've personally never faced either of them, so they're a non-issue. And because the majority of UU pokes are lighter than those of OU, Ludicolo will almost always run Energy Ball over Grass Knot.
Lastly, you're assuming I'd stay in on you're CB Relicanth and SD Toxicroak. Obviously Milotic can't beat an entire Rain team by itself, but paired with Cresselia, for example, Rain is easy to handle.
Relicanth is definitely under utilized thanks to Kabutops, with a laughable amount of usage last month, but I don't see how it can be referred to as wasting Rain Dance when a Swift Swim Head Smash devastates nearly everything. But onto the main issue..
Ludicolo doesn't have to have Substitute, or Grass Knot to beat the most Specially Defense Milotic you could find (Calm, 252/252). Energy Ball delivers a 45.7% - 53.8% blow. Stealth Rocks, or prior damage means Milotic is in trouble. She can't Toxic the first turn either, or that will be the last thing she can do (Ludicolo outspeeds your Milotic without Rain). She must simply try to outstall Life Orb.
Even with this, statistics from last month show more Ludicolo's run Grass Knot in UU, than Energy Ball by a fair margin. | Grass Knot | 37.1 | Energy Ball | 28.4 |
Ludicolo also ran Sword Dance 20% of the time last month, and of course, a +2 Seed Bomb destroys ANY Milotic. 152.8% - 180.2% damage to Calm max/max, and 112.5% - 132.6% to Bold 142HP/max Defense.
If Ludicolo is running a Specially Defensive set itself to setup Rain Dance, then it more than likely carries Leech Seed, and is not threatened by anything Milotic has outside of Toxic.
Calm nature Milotic was used 10.5% of the time last month, and 71.8% of the time it ran no SpDef, 10.2% it ran 100-150, and 5% of the time it ran another amount.
I wouldn't say using Lanturn, who is a great check to many Rain Dance threats, including Milotic, Gardevoir, and even itself! It receives STAB Thunder which is 100% accurate in the Rain (and not abused enough on Rain Dance), to spread paralysis, and it has 'double' STAB Hydro Pump/Surf in the Rain. It will often find itself completely walling direct threats to Rain Dance, and will have free turns to setup more Rain Dance! Toxicroak is interesting in the Rain, because Dry Skin allows it to abuse Life Orb without fear. It is also a good check with STAB Fighting and Sucker Punch to many special defensive walls, like Chansey, Milotic, Gardevoir and Registeel.
Just because you're not abusing Swift Swim does not mean you're not abusing Rain. Keep in mind, if you end up using multiple specific Rain Dance checks, hoping to outstall them, there's a likelyhood when you face a non-Rain Dance teams, you'll be in trouble.