As for comments on the battle:
It looks like early on Hugendugen wasn't thinking Grassy (cause there was Palkia) and went to Donner so that he could soften Palkia's mighty Surfs with Sun. When his double switch backfired, he expected good old CM grassy and was predicting Sweep to double switch out of the Forretress switch-in so he decided to SR and ended up with a burned Groudon. This really hurts him because his team didn't have much to come in on Lando-T and that made Donner even bigger fodder for it. (as well as wrecking that sun he wanted to weaken Kia) Sadly when Hugendugen did go for the Forry (that was already burned) to punish Grassy, Sweep doubled this time to bring in Lando and profit. On top of Donner and Forry crippled, Tar fucked over latias and Hugen didn't really have much choice but to force it to kill grassy seeing as it fucked over his team so well. Once that was gone he didn't have anything left for Palkia besides Recover spamming which ended in a crit.
Basically, Hugendugen wasn't aware of the changing metagame and misplayed against Grassy as well as being unprepared for Lando-T. (and he also was thrown off by Grassy in addition to the Palkia) Thanks for the game, guys.