If you want to complete the post-game of Dragon Ball Z Kakarot and get all the trophies, you will have to upgrade the training room up to level 10, which requires special and rare components such as meteorites. Here's how to get them.
DBZ Kakarot: Meteorites
You'll probably be happy to know that it's very easy to get your hands on the meteors once the Buu saga is over. The meteorites will then be available at material vendors in Satan City, Gingertown and Lucca Village. They are very expensive, however, as they are sold at 12,000 zenis each. The time has therefore come to sell all your useless items, or even to farm zenis. A wish with the 7 crystal balls can also get you out of this mini financial crisis.
DBZ Kakarot: Refined gold
Refined Gold, on the other hand, will ask you to go out and play miner's miner on the field. You'll need to find some veins, which isn't difficult with NPCs signalling their proximity with dialogue bubbles. You can find them in the cave in the Western Forest Zone under the Karin Tower among others. Destroy the veins, if you don't get any refined Gold, you can leave the zone and return to it, or save and reload, both methods will make the veins reappear.
During the interlude between the Frieza Saga and the Android Saga, you'll have a lot of work with the sub stories of DBZ Kakarot. We start with the rescue of a cook in distress.