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Wow, thanks for the detailed response! I've been playing around with changing up my team a lot now, haven't decided on what line-up to use yet though so I'll keep the team in the OP as is for now.
I'm testing out Choice Specs Latios as you've suggested. I'm also experimenting with different sets...
Thanks for the feedback! I'll look into Gliscor, though I don't think Defog removes hazard in Gen 5.
I'm also looking into using Blissey or Chansey in place of Tentacruel, and Thundurus-T in place of Dragonite.
So I haven't played Pokemon (competitvely or the games) since Gen 5, but I've decided to get back into it recently. I decided to get back into the groove with Gen 5 OU before learning about what I missed in the meantime, so I dusted off my old rain team I had before I left.
After playing a bit...
Edit: Checking at my schedule, it seems I'll be really busy until early-mid April. Also leaving on vacation the last few days of March, so I can't join. Sorry about that.