Tailwind is meant for doubles and only works 3 turns b/c even Marrowak can outrun Mence in Tailwind, DD or not. Suicune should set up 5-8 turns of Tailwind upon switching in, but not infinite amount (mainly b/c weather doesn't cancle it out). lol. An item that boosted it from 3 turns to five like the normal feild affects would help a lot on my team.I think a weather condition worth elaborating upon would be Tailwind. Perhaps lower the speed increase slightly and have an auto-inducer and/or have an item that expands the number of turns it lasts. It would work like a trick room team but without having to rely on slow, bulky, pokemon to sweep, giving you the liberty of using slower Pokemon and now-uncatchable fast-Pokemon.
I'm at least happy to see it's actually much more easy and possible to make a variant team w/ Tailwind now that it is a move tutor move. Being only three turns means 85% of your team needs it, and that was a problem when all the Pokemon were weak to Discharge.
Gravity was a very similar situation until a move tutor came along.
Gravity and Trick Room could also use items. It would make sense if they had the same item.
Maybe make Volt Tackle/Flare Blitz move tutor moves (Luxray would be UU, but Flareon would still have trouble w/ the recoil.).
An attack that summons Fog should also be a move tutor move.