His team was really weak to non-choice Palkia. He made a huge mistake turn one by leaving Tentacruel (Brave Bird is still a 2HKO and one layer of TSpikes isn't worth it), also I have no idea why he didn't DM with Dialga against Palkia because it would have shredded 50% from everything on your team, including your steels.
I do like your team, though. Palkia in sun is quite underrated. What Arceus forme do you use?
It's actually a team I made to look normal, but have some odd/underrated sets. First of all is the groudon that I use is a set that I made up (if you made the set first I'm sorry for taking credit I truly did not know) with earth plate, eq, sr, se, and RP. It gets late game sweeps on weakened rain and sun teams, such as the good chance of netting the OH-KO on palkia after rocks and the good chance of netting the OH-KO on scarf ogre with rocks and a layer of spikes, as well as the chance of oh-ko on a specsogre with some speed investment + rocks and 2 layers of spikes.
I also included red card Forretress, to check threats once that set up to +6 on my forretress, while I set up spikes, toxic it, and spin away their own hazards. It might sound wierd on paper but it works in practice. I know that this set has been used before (Never see it on the PS ladder, but see it on the PO ladder once in a blue moon by people lower on the ladder) but I never see it used on high ladder, so I wanted to try it out, and it works very well. Not to mention, annoys the d tail lugias and giras that like to phaze stuff around.
I also have included a CB ho-oh for max wall breaking powah, a ghostceus to keep my hazards up, and to beat certain things that trouble my team, and standard genesect to keep momentum, go Kamikaze on threats that have picked up too many boosts, and to save my ass late game with flinches . Last but not least lustkia, which is a big nuisance to all teams around, and in Donkey's words, 6-0's teams that don't have an answer to it. I have also been testing latios for that last spot, as a one time kyogre check and be a dick to stall, but I have not had my heart set on either of them. I like this team a lot, but I have truthfully only played about 15 matches with it, with 3 of them with the unhappy guy in the replay.
BTW: I kept palkia in on dialga, because I predicted the guy to go for the rocks, and went straight for the eq on the tenta because nothing on his team would be happy taking a CB earthquake, and I figured that Giratina and ferrothorn would not be happy taking a brave bird to the face. In the end, those crits did not matter, because the kyogre could not KO me with thunder from that range of Hp and I knew that I could ok-ko in return, so I assumed that the #3 ranked player on the ubers ladder (I.e. the guy I was facing) would still go out into the ferrothorn, and I would still predict his ass with the fire blast. Unless the Giaratina was heavily invested in special bulk, there was no way in hell that it would survive a lust orb boosted spacial rend from palkia, so that crit didn't matter.
This concludes my longest post ever made on smogon from my I pad, and I hope you, and the other people who read this are well informed.
Have a Nice Day.