Better than Moonlight overall. I hate the strat, but the first obvious thing would be Wish+Protect. Kills moveslots though. Should be fun for it and the team to run the move with Screens.Not sure how much this helps Cress. Wish didn't base its healing off of the user's HP until Gen V, so it's not going to fully heal fat things that lack non-Lefties recovery. Having a healing move not gimped by weather is cool, at least.
Jynx actually loves permanent Mimic, too. 100% chance to grab TWave, Tbolt, or Recover from standard Starm (Ty's post says you'll Mimic moves you don't already know, so Blizz gets skipped), which is an otherwise poor lead matchup. A lot of Chan have a similar 3/4 (with IB being a waste), though some variants are less useful to face. Considering they're two of the best switch-ins to Jynx, it becomes a much more interesting gamble for the last slot.While Mimic can only be useful to Zapdos in case it gets the equake from gol/don, I think permanent Disable would be really amazing today. Disable+Substitute Jynx will be awesome and finally we'll have a good reason to use Substitute (except for Dodrio). Jynx would be about to support the team in such a good way, baiting Body Slam (Lax, Tauros) / Softboiled-Recover (Chansey, Kazam) and letting Zapper clean easily without para chances.
RBY could change in such an incredible way if the Disable/Mimic become permanent!
Charizard couldn't learn Solarbeam till DP, actually, so no dice there. I'm just spitballing here, but I see Sunny Day being the most interesting weather. It would have use as an anti-sand tool, Entei would definitely get somewhat better (might not be enough to become prominent, though), and if you had a reliable way to eliminate sand setters I could see Solarbeam as an option over Giga Drain on Exeggutor. I don't think it would want to give up a moveslot to run Sunny Day itself, but Spikes or a little chip damage would make it very threatening to Tyranitar (12.8% chance to OHKO after Spikes), and even without Spikes it gets 2HKOs on Suicune, Vaporeon, and Steelix, an OHKO on Marowak, and does 39-49% on Raikou.I actually think Sun gets the strongest boost of them all, Entei and Moltres can deal heavy, heavy damage with Sun boosted Fire Blasts without having to worry about auto-losing to Snorlax (still a counter but no longer reliable), rain seems the weakest to me. I wonder if DrumZard could make use of Solar Beam for the rock/grounds/suicune