Originally Posted by Fat Frog
The problem is pretty much all weatherless teams will work better with a Tyranitar or Hippowdon as a wall, even only for blocking rain. The CeleTran core mentioned above works better in sand than weatherless, period. Heatran is neutralized by rain and Celebi by sun. If you want to use weatherless many pokemon are dead weight in certain matches against certain weathers, so the pool of good pokemon is smaller. Weatherless is never going to be the best style,but it will probably never go fully extinct.
I was conflicted on deleting this because it ignores the point of the OP which is to discuss how a team without weather can deal with Drizzle and Drought (and the problem mons with-in). However, you bring up a point (unintentionally or not) that I want to address:
"If you want to use weatherless many pokemon are dead weight in certain matches against certain weathers, so the pool of good pokemon is smaller"
I don't agree with this theory at all. It questions the ability of the team builder in that he can't effectively prepare for weather with what he is given. I'll take an example of Celebi vs Sun. This is pretty much as useless as it gets right? Except the Celebi player with a team designed well enough to handle Sun is not at an immediate disadvantage. U-Turn or Baton Pass, using an offensive Stealth Rock set with Hidden Power Fire/Giga Drain(or Leaf Storm), etc are all ways to be able to play around the sun team and make use of a key Pokemon. Celebi is not going to play the same role in every game. With a Celebi, I can lure in their Fire-types and get out to something that puts pressure on them right away, rather than lategame where they have a better chance to passively damage my Pokemon. The offensive set I mentioned earlier handles Forretress/Donphan/Starmie (Spinners you would see on sun teams) and Celebi's presence allows you to play the game at your pace.
I could create examples of this for every "weatherless Pokemon". The better player can dictate the pace of a match so that even the most useless Pokemon (Celebi vs Sun) is controlling tempo.
Is sand bad? No, I could definitely make a team with it thrown on, but I'm limiting my team slots to just win the weather war when I can use skill and tempo to do it for me. This is why you should want to become a better player (and a better team-builder). Knowing that you can execute a strategy that sets the pace for you just gives you a sense of "yeah I'm doing this shit right". Weather for the sake of weather doesn't have to be the norm and I think this thread is a step in the right direction towards changing it, and I don't think your post helps at all, especially considering it is flat out wrong in some regards.