>>33023672I have no clue, honestly. If they've ever talked about that publicly, I don't know where the posts are, but my guess is that it's some heuristic mixture of specific Pokemon with specific items, and those specific Pokemon with specific items being on the same team as each other.
Like, eviolite Chansey is not a stall mon on its own, groundium Z dugtrio is not a stall mon on its own, physdef skarm is not a stall mon, toxapex isn't, physdef defog zapdos isn't, and SpeDef mega sableye isn't....but all on the same team they result in a "stall playstyle", and everyone knows how a game against that team is going to be played.
