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Here's the opinion of someone who just finished the main story, the end is anticlimactic.
After quelling Lord Avalugg's frenzy (which is basically the real final boss considering its sheer scale and fair difficulty), time and space get all fucky wucky, you get exiled for possibly being to blame for said fucky wuckies but it doesn't seriously affect gameplay, you get the mcguffins from the Lake Guardians after giving you a test rather than an actual battle against them (who can speak now so I hate them even more), you make the red chain with the Lake Trio, the Potato Mochi guy is actually a ninja who's charged with "doing what Kamado won't" that tries to kill you, you have to beat Kamado in his XY Elite Four cosplay to prove you're not wrong, you use the red chain on Dialga/Palkia (who talk through Adaman/Irida, fantastic), you are required to catch them for later so it respawns if it faints (easy exp farm) and they're easier to catch than the Alpha Gabite you'll run into on your way to it, once you catch it in a Poke Ball while with 100% HP, the other one appears and everyone retreats because you can't just ask the Lake Trio for more McGuffins to make another Red Chain even though Cyrus forcefully does just that in DPPt and BDSP, Dialga/Palkia tells you their momma's recipe that always calms down their sibling when they get hangry, the ingredients are the leftover chain pieces, the stuff elemental plates are made out of and a Poke Ball, you aren't allowed to fight Dialga/Palkia without Palkia/Dialga in your party, when you do fight it, it turns into its awful "Origin" form, you throw balms you suddenly have because it's frenzied, all of its attacks are pathetic except for the first one that teleports into you, I swear it doesn't have as much health as Avalugg has, I was never presented with the opportunity to send out any of my Pokemon, you catch Dialga/Palkia, everyone celebrates, all you get to see of that celebration is a picture, Arceus says "100% pls", credits.