Pokefan_1987
Avid Pokemon TCG Card collector.
The fact that each game doesn't have enough spare evolution stones including shiny stones. The Inverted battles aren't reliable as a alternate means of getting more since the rewards are random and might not be even be the right stone.
This means trying to go for full national dex is tough when several pokemon share the same type of stone such as moon stone, sun stone and shiny stone. Ultra Sun is mildly better at this since you can send your pokemon on a hunt for stones.
Also certain routes are guilty of sharing too many pokemon on it. Skiddo is only on a single route one in Gen 6 that shares the "Purple Flower Patch" with 9 other pokemon. And it didn't want to show up. Had to trade for one.
This means trying to go for full national dex is tough when several pokemon share the same type of stone such as moon stone, sun stone and shiny stone. Ultra Sun is mildly better at this since you can send your pokemon on a hunt for stones.
Also certain routes are guilty of sharing too many pokemon on it. Skiddo is only on a single route one in Gen 6 that shares the "Purple Flower Patch" with 9 other pokemon. And it didn't want to show up. Had to trade for one.