>>55195265>Yours sound like they had a more mystical approach to themThat's because it is. The big giant magic robot was meant to be a part of a side quest.
After you get friendly enough with a guy, he gets a chance to investigate a secret ruin. Both investigate, fight the Ghost and Ground mons, some Golems and Statues, and reach the end. In the middle of the road you find a cog that acts like a key, opening the sealed chamber.
Both dig around and say "there's only a funny looking statue, let's go home". Then, classic closed door plot twist, and a fight with the dormant giant (no capture yet).
A battle later, you go where the giant was, find a door, and find the central chamber. Treasure aside, your friend reads the text on the walls.
This civilization lived when pokemon were forces of nature, getting their homes and lives destroyed, and this place was a final stronghold against the pokemon takeover. In fact, here the story of Sinnoh of the human and the sword is seen as a hero fighting demons.
Anyway, both find the schematics of the robot, and leave with enough treasure and relics that your friend will become the Indiana Jones he wanted to be. But before leaving, he captures the pokemon. He knows you want to do the league challenge, and this was only a sidetrack, so he gives you a choice: want the war machine now or later?
If you pick now, you have the giant, nothing else. But if you pick later, he comes back at the 7th gym city, and tells you he became famous and hired by labs to become a treasure hunter. And as a way to say thank you, he gives you the shiny version of the golem with perfect IVs. He even jokes saying "he only needed a bit of polishing".